In a Study of Women the Following Notation Was Used

In a study of women the following notation was used: Y = f(X) where Y represented fertility plans and X represented occupational plans. This states:

A) that fertility plans are a function of (or are affected by) occupational plans.
B) that occupational plans are a function of (or are affected by) fertility plans.
C) that occupational plans are not a function of fertility plans.
D) that fertility plans are a function of (or are affected by) occupational plans and is a hypothesis.
E) that occupational plans are a function of (or are affected by) fertility plans and is a hypothesis.