because the word means ridiculous. I do not think is the meaning of the sentence

The sentence says: certain inventions are so so and we can even not have them. They are not necessary.

BUT others are outstanding and critical for our advance

E is the answer

Should not it be B because there is a BUT in there which suggests a contrast and world beaters is on the extreme positive side, so if we go by the rules we end up at ludicrous which is extreme negative.

Aside from the fact that the grammatical constriction of the sentence is unclear.

The pronoun its at the very beginning should refer to the valley that should be the subject. Which is placed at the end of the sentence

Only For this, well far from a GRE sentence, I would be suspicious about the genuinity of the questions

the sentence (all trace their lineage to the Valley.) proved that non of the options is right

Why can't it be pragmatic
the sentence (all trace their lineage to the Valley.)
Shows that those inventions are possible by because of latter mentioned inventions

Can you explain on this?

Posted from my mobile device

Hello from the GRE Prep Club VerbalBot!

Thanks to another GRE Prep Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.