a mutation in a parent's body cell a mutation in a parent's sex cell the natural selection of a trait the artificial selection of a trait
I gave my students this multiple choice question: What can cause an offspring to have a physical trait neither of its parents has?

Only one answer is correct among these 4 choices:
- a mutation in a parent's body cell
- a mutation in a parent's sex cell
- the natural selection of a trait
- the artificial selection of a trait

Could you tell me which one is correct?

a mutation in a parent's sex cell