Context: Mabel has a small vegetable garden, which includes a compost pile of food scraps. She notices that some of the squash plants growing next to the compost pile grow differently than squash plants that are farther away. She wonders what factors affect how her squash plants grow. So, she decides to design an experiment. She has the following supplies available:
one type of squash seeds
four large clay pots
soil
a compost pile
water
Using only these supplies, which question can Mabel investigate with an experiment?
A. If squash seeds and tomato seeds are planted with compost, which type of plant grows larger?
B. Do squash plants grow larger if the seeds are planted in small pots or in large pots?
C. Do squash plants grow larger if the seeds are planted with compost or without compost?
Identify the correct option from the choices provided and respond with the letter of the correct option.

C