Context: Cassie is making a fruit salad. She mixes some apple slices with orange and pineapple slices, and leaves the rest of the apple slices on the counter. A few minutes later, she notices that the apple slices on the counter have turned brown. She wonders what factors affect how quickly sliced fruit turns brown. So, she decides to design an experiment. She has the following supplies available:
two apples
two bananas
orange juice
a kitchen knife
Using only these supplies, which question can Cassie investigate with an experiment?
A. Do apple slices dipped in orange juice turn brown more slowly than plain apple slices?
B. Do apple slices turn brown more quickly if they are dipped in sugar or in orange juice?
C. Do slices of pear turn brown more quickly than slices of banana?
Select the correct answer from the provided options and reply with the letter associated with it.
Answer: A