Brenda Walks by the Room of Her Four-Year-Old Son, Zach

Brenda walks by the room of her four-year-old son, Zach, and sees him and his four-year-old cousin, Justin, standing, facing each other, with their pants and underpants down. When Brenda asks Zach what's going on, Zach grins and replies "We both wanted to see our things." Zach's behavior is . . .

A) common for children Zach's age, and thus not a cause of concern .
B) very unusual for children his age, and thus a major cause of concern .
C) a sure sign that Zach will prefer same-gender sexual partners in adulthood.
D) a sign that Zach will likely be an exhibitionist as an adult.