The Rectangle Metaphor About Heredity (Nature) and Environment (Nurture) Illustrates

The rectangle metaphor about heredity (nature) and environment (nurture) illustrates that

A) only environment contributes to motivation; heredity makes no contribution.
B) how much heredity and environment contributes to motivation depends on the behavior.
C) both heredity and environment contribute equally to motivation, i.e., 50% each.
D) only heredity contributes to motivation; environment makes no contribution.