Context: Carla leaves a glass jar of cold tea outside in full sunlight. When she goes to get it, she notices that the tea is warm. She wonders what factors affect how warm a liquid gets from sitting in the sunlight. So, she decides to design an experiment. She has the following supplies available:
two identical glass jars
two jar lids
tap water
a measuring cup
two thermometers
Using only these supplies, which question can Carla investigate with an experiment?
A. When placed in the sun, will eight ounces of water in a closed jar or eight ounces of water in an open jar get warmer?
B. When placed in the sun, will eight ounces of water in a glass jar or eight ounces of water in a plastic cup get warmer?
C. Will eight ounces of carbonated water or eight ounces of tap water get warmer when placed in a jar in the sun?
Answer with the option's letter from the given choices directly.

A