I vote for C.

I'll explaining. Please let me know if it is incorrect.

Let the number of ppl who request for brochure be X

Let the number of ppl who applied to that MBA Program: x/2

(1) Twenty percent of those who apply are extended offers of acceptance

Means,

.2*(x/2)=x/10 are given offers.But we do not know if they enrolled or not.So A is not sufficient.

(2) Fifty percent of those who receive offers enroll in a different MBA program

We do not know the number who receive offers. So,B is not sufficient.

Let us take statement 1 and 2.

Thus, students who received offers but did not join the MBA program:

X/10-.5*(X/10)

Thus, we would get the number of persons who eventually enrol.

(

Paul: I made an assumption here that fron all those who were offered admissions,they either went for this MBA program or a different one.

No body backed out and decided not to do an MBA this year.)

_________________

510 on my first GMAT. 610 on second GMAT.!

The struggle continues.