Context: Clarence and his classmates are growing tomato plants in the school garden. He wonders what factors affect how tomato plants grow. So, he decides to design an experiment. He has the following supplies available:
three different types of tomato seeds
one bag of potting soil
five identical clay pots
water
Using only these supplies, which question can Clarence investigate with an experiment?
A. Which type of soil will cause a certain kind of tomato plant to grow the most fruit?
B. Does a certain kind of tomato plant grow taller when planted in a clay pot or in a plastic pot?
C. Which of the three types of tomato seeds sprouts the fastest?
Choose the right answer from the options and respond with its letter.

C