One of the most important decisions for most people experiencing being relocated for work is if to purchase a home immediately.

(A) being relocated for work is if to purchase

(B) being relocated for work is whether they should be purchasing

(C) being relocated for work is whether or not they purchase

(D) relocation for work is if to purchase

(E) relocation for work is whether to purchase

The OA is E.

Why the option D is wrong?