From the GPC verbal mocks, here is the original text:

"Chicago-based Alligator Records is now the premiere blues label, one that has a world-wide following and sells more blues recordings than any other label. It had its genesis at a concert by blues performer Mississippi Fred McDowell. In the audience was college student Bruce Iglauer who recalls, “It was as if he reached out and grabbed me by the collar, shook me, and spoke directly to me.” Iglauer immersed himself in the blues, hosted a blues program on the college radio station and took a job as a shipping clerk for a small Chicago blues label. He used a $2,500 inheritance in 1971 to start Alligator.
The Sugar Hill label specializes in bluegrass and contemporary folk. Located in Durham, North Carolina, it is a 1978 creation of Barry Poss, then a James B. Duke fellow at Duke University. Poss abandoned a budding academic career in mid-thesis to start a shoestring label. Sugar Hill now issues the best-selling bluegrass recordings and is a frequent recipient of record industry awards.
Much of this is obviously a triumph of niche marketing. It reflects the use of cutting edge technology and communication skills to weld new audiences that support and expand the audiences for older folk art forms. But there’s a critically important factor not to miss: Iglauer, Poss and other businessmen who created a new wave of successful recording companies in the past twenty-five years were inspired by the artists and art forms, not by business schools. They are as much in thrall of great artistry as any other group of arts leaders.
In 1995, there were 127 local blues societies and 289 local bluegrass societies in the U.S. — almost all created during the preceding 20 years and virtually all volunteer-run organizations. They range in size from a hundred members to thousands. Most have newsletters and sponsor summer festivals and concert series supported by ticket sales. An example is the Washington, D.C. Blues Society which began in 1988 with a meeting of eight fans in a barbershop. A year and a half later it had grown to a thousand dues-paying members.
In 1965, the first bluegrass festival was held in Virginia. In 1996, 516 bluegrass festivals were held in an amazing array of locations, including five on winter cruise ships. These are in the USA and Canada, but other nations have them as well. The largest outdoor music festival held in the Czech Republic is a bluegrass festival. Today, more than 300 bluegrass bands are active in Tokyo, Japan."

And Question:
The passage suggests that bluegrass music
A. can be inspired by a single musician in a distant country
B. has succeeded in the absence of conventional academic entrepreneurship
C. has more established artistic roots than do other genres of music
D. in its contemporary form is more successful abroad than it is domestically

Official answers were B and C, but I don't see how C can be drawn from the passage. My understanding is that "older folk art form" does not entail "older than other genres of music" as there are many more genres of music other than folk art form.