Thursday, June 12, 2014

grammar - "Set of techniques"; singular or plural?

I have an English course book that contains this question:



Fill in the blank
"The book is a set of techniques that systematically __ the learner for interaction with target language speakers".
(A) prepare (B) preparing (C) prepares (D) prepared."



The answer given in the book is A, but isn't C correct?
I used Google and found this example "DNA technology is a powerful set of techniques that ALLOWS scientists to examine, change, and create new genetic material"

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