Why Does the Head of the Social Security Administration (SSA)have

Why does the head of the Social Security Administration (SSA) have less policy influence than the head of the Federal Trade Commission (FTC) ?

A) because the SSA operates under fixed rules than cannot be altered based on circumstances
B) because the SSA budget is much smaller than the FTC budget
C) because the SSA is an independent agency and the FTC is a presidential commission
D) because the SSA has fewer clientele groups than the FTC
E) because the SSA affects a smaller portion of the population than FTC policies