OFFICIAL EXPLANATION

The correct answers are B and E.

"Proliferated" means "to grow in number rapidly" and is similar to "multiplied," meaning "to increase in number," so choices B and E are synonyms and the correct answers. Choice A, "gotten along," means "make progress" and is similar to "thrive," choice F, meaning "to make progress, to succeed," but neither includes the idea of increasing in number implicit in the balance set up by the phrase "increase as restaurants . . . have . . ." Choices C and D, "progressed" and "advanced," are also synonym pairs and mean "to move forward, to improve," but they lack the idea of increasing in number.