Context: Alana is outside with her friend on a sunny day. Alana is wearing a light-colored shirt, and she notices that she feels colder than her friend, who is wearing a dark shirt. She wonders what factors affect how fabric warms an object. So, she decides to design an experiment. She has the following supplies available:
a black cotton shirt
a white cotton shirt
two identical empty glass jars
two thermometers
Using only these supplies, which question can Alana investigate with an experiment?
A. When placed in the sun, does a glass jar wrapped in a black cotton shirt heat up more than a glass jar wrapped in a white cotton shirt?
B. When placed in the sun, does a glass jar wrapped in cotton heat up more than a glass jar wrapped in wool?
C. When wrapped in a cotton shirt and placed in the sun, does a large jar or a small jar heat up more?
From the given choices, choose the correct answer and respond with the letter of that choice.

A