disadvantage of group intelligence tests include that

Question

a. all test taker must wait until all registered individuals arrive
b. proctors are often inconsistent and allow some test takers a longer time to respond or to take testing breaks
c. some test taker talk to themselves and disturb others
d. some test takers are more motivated to perform at their highest level in one one testing situation

i think its D
but not sure

Answer 1

I agree.

Answer 2

Assuming that you mean "one on one," I agree too.