Which of the Following Is True of Incest

Which of the following is true of incest?

A) People of all cultures invariably have sexual interest in their close relatives.
B) People living together from very early in life are highly likely to develop sexual desire for each other.
C) Scientific consensus suggests that inbreeding due to incest creates healthy offspring.
D) Incest avoidance is a healthy sign of normality for families.
E) Research shows that incest within the nuclear family occurs less frequently than once thought.