When a 4-Year-Old Child Has an Erection, We Can Most

When a 4-year-old child has an erection, we can most likely assume:

A) That his physiology is functioning normally.
B) That he has experienced something causing him to be sexually aroused.
C) That he is likely to feel embarrassed about his erection.
D) That he is not likely to have erectile dysfunction later in his life.