Which One of the Following Statements Most Accurately Describes the Effects

Which one of the following statements most accurately describes the effects of a particular gene on a child's development and functioning?

A) A gene's effects depend partly on the child's health and activity levels and on environmental conditions in which the child lives.
B) A gene is like a computer program that, once started, proceeds through a series of steps to its inevitable conclusion.
C) A gene is essentially a ticking "time bomb" that is scheduled to "explode" at a certain time regardless of other things that might be happening in the body.
D) Any single gene's impact is highly unpredictable from one individual to the next.