Official Answer awaited but my reasons for choosing D is as follows:-
Ms. C:-Requiring students to pay for extracurricular activities will not make our program better.
premise:-It will produce an unequal distribution of students along socioeconomic lines, and that would defeat the purpose of the program
Ms. M-But these programs are being cut all the time due to lack of funding.
My prethinking so anyways these programs are not benefitting the purpose because of no funds.
Let's dive into the question
A. offers additional evidence for the correctness of Ms. Campbell's conclusion.
It does not offer any evidence to support.B. states one of Ms. Campbell's unspoken assumptions.
It is not an assumption.C. contradicts Ms. Campbell's claim about the purpose of the program.
It is not contradicting. It is just saying a fact that weakens the whole purposeD. identifies a weakness in Ms. Campbell's rationale.
correct. because anyways these programs are not benefitting the purpose coz of no funds.E. implies that Ms. Campbell's conclusion is correct, but not for the reasons given.
it is not saying that the conclusion is correct on the contrary it is telling a weakness why the conclusion doesn't work.