SAT writing question?

VD a

New member
I have a SAT question:

(Identify the error in the following sentence)
The vegetarian movement in this country, which has shown increasing growth over the last thirty years, was begun at a farm in Wheaton, Vermont, in the late 1800's.
A. increasing
B. over the last thirty
C. was begun
D. in
E. No Error

The answer is C but I don't get it. There is no explanation in the book either. Can anyone please help me with this?
 
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