Context: Emma visits a museum about ancient Greece. She notices an exhibit with models of wooden catapults that were used to launch large rocks across battlefields. She wonders what factors affect how far a catapult can launch an object. So, she decides to design an experiment. She has the following supplies available:
a wooden catapult with a 10-inch-long arm
a wooden catapult with a five-inch-long arm
two identical rubber balls
Using only these supplies, which question can Emma investigate with an experiment?
A. Does a catapult with a longer arm launch a rubber ball farther than a catapult with a shorter arm?
B. Does a heavier ball travel farther than a lighter ball when launched from a catapult?
C. Does a rubber ball travel farther when launched from a metal catapult or from a wooden catapult?
Choose the right answer from the options and respond with its letter.

A