Pumpkin patch: suppose we plant pumpkins in a garden where half of the plants are shaded. then, to test a new fertilizer, we fertilize the plants in full sun and do not fertilize the plants in the shade. in the fall the fertilized plants yield more, bigger, and prettier pumpkins. which of the following is the explanatory variable? a, fall seasonb, fertilizerc, pumpkin harvestd, amount of sunshine