Answer:
401 are the required votes
Therefore, option C is correct.
Explanation:
We have been given that there are 535 members in a class
And 3/4 of the members have voted to take a field trip that means
3/4 out of total will be the members the total votes for the field trip.

On simplification we will get
The required votes which will be
After rounding off it will be 401 votes.
Therefore, option C is correct.