It is helpful to form hypotheses because they help focus your investigation on a single idea to be tested. Suppose that a farmer wants to determine what the best growing conditions are for almond trees on his farm.

Which of the following are appropriate hypotheses that the farmer could test?

A. Almond trees live longer if fertilizer is mixed into the soil once every three months.
B. Almond trees produce larger almonds if they are watered daily and fertlizer is used
C. Almond trees grow taller when they are planted in direct sunlight
D. Almond trees produce more almonds if they are watered once a day.