The parabola opens to the right since the focus is to the right of the vertex. So the square part will definitely contain a y. By elimination the answers can't be A or C. The vertex is (2,3) so the answer is B.
Longer answer:
formula to use is (y-k)^2=4p(x-h) where the vertex is (h,k)
So (2,3) is our vertex so enter it in giving
(y-3)^2=4p(x-2)
p is 5 since 2 and 7 are 5 units apart
p is positive because again focus is right of vertex
