date of flowering and the fruit yield fruit yield and taste of the fruit taste of the fruit and smell of the flower date of flowering and smell of the flower
I gave my students this multiple choice question: Which rankings of trees would most likely useful in a scientific study of fruit production in apple trees?

Only one answer is correct among these 4 choices:
- date of flowering and the fruit yield
- fruit yield and taste of the fruit
- taste of the fruit and smell of the flower
- date of flowering and smell of the flower

Could you tell me which one is correct?

date of flowering and the fruit yield