please give me the right answer
In Chelsea's essay on how homework is not directly linked to student success, she introduces the following counterclaim:

Conversely, some school administrators argue that homework improves learning by keeping students focused on their studies.

Which of the following rebuttals effectively refutes that counterclaim?

A. It really can't be proven either way whether homework affects academic performance, so this counterclaim is false.
B. Frances Higginbotham, Professor of Education at Anytown University, disputes this idea by surveying a random group of teenagers, and he finds no significant effects of homework on academic preparedness.
C. Despite this belief, homework actually led to an increase in test scores.
D. That is simply just not true and there is nothing to elaborate on here because it's just basic common sense.