Context: Jamal has a pet lizard. Jamal notices that on some days, the lizard is active and runs around the tank. On other days, the lizard hardly moves at all. Jamal wonders what factors affect how active his lizard is. So, he decides to design an experiment. He has the following supplies available:
one pet lizard
live crickets
live mealworms
one heating lamp
Using only these supplies, which question can Jamal investigate with an experiment?
A. Is the pet lizard more active when it is fed crickets or mealworms?
B. Is the pet lizard more active when its tank is heated with one heating lamp or with two heating lamps?
C. Is the pet lizard more active when it is fed insects or lettuce?
From the given choices, choose the correct answer and respond with the letter of that choice.

A