I am very confused!

GRE Verbal Problem Solving
1

The screenshot of 7 questions on the video (Day 2 HW answers on the 2-month plan) at 50:00’ but Greg discusses only 4 out of these - I am confused on why the answer for #7 is A and not C.

When theories formerly considered to be (i) _______ in their scientific objectivity are found instead to reflect a consistent observational and evaluative bias, then the presumed neutrality of science gives way to the recognition that categories of knowledge are human (ii) _______ .
A.) Disinterested…constructions
B.) Callous…errors
C.) Verifiable…prejudices
D.) Convincing… imperatives
E.) Unassailable… Fantasies

2

The 1st blank of the answer should be opposite of consistent observational and evaluative bias as given in question which will be Disinterested this itself gives the answer. Option B is one of the confusing option but A is the best choice.