In What Sense Does "Y-Predicted" Provide Only an "Educated Guess

Multiple Choice

In what sense does "Y-predicted" provide only an "educated guess" of Y?

A) Exact predictions of Y are extremely rare: exactness is achieved only when the relationship between X and Y is perfectly linear.
B) Y-predicted typically loses precision when X and Y are both interval-ratio variables; it is more exact when at least one variable is measured on a nominal scale.
C) Y-predicted predicts Y without taking into account values of X.
D) Y-predicted is based on Y's overall mean and ignores the conditional mean of Y.