Venn Diagram

[nycmath]

See attachment.

[Math Tutor]

S ∩ T is the overlap of the S and T circles — that is casey (in S and T only) together with drew (in all three): S ∩ T = {casey, drew}

V is everything inside the bottom circle: V = {drew, jade, glen}

Now take the union of those two — everything in either one:

(S ∩ T) ∪ V = {casey, drew, jade, glen}

So the answer is A.