the time of day the seeds are planted the amount of fruit picked after dark the type of soil in which the crops are grown the number of times daily that the farmer observes the crop
I gave my students this multiple choice question: An agriculturalist predicts that the tomato harvest will be very good this year. Which has the greatest effect on the size of the tomato harvest?

Only one answer is correct among these 4 choices:
- the time of day the seeds are planted
- the amount of fruit picked after dark
- the type of soil in which the crops are grown
- the number of times daily that the farmer observes the crop

Could you tell me which one is correct?

the type of soil in which the crops are grown