freckles develop from light. certain foods cause freckles. certain habits cause freckles. freckles are an inherited trait.
I gave my students this multiple choice question: Parents with freckles often have children with freckles. This occurs because

Only one answer is correct among these 4 choices:
- freckles develop from light.
- certain foods cause freckles.
- certain habits cause freckles.
- freckles are an inherited trait.

Could you tell me which one is correct?

freckles are an inherited trait.