Final answer:
According to Newton's second law of motion, the heavier body has to be acted upon by the larger force if both a light and a heavy body have the same acceleration.
Step-by-step explanation:
If a light body and a heavy body are both given identical accelerations, the body acted upon by the larger force must be the heavier body. This is determined by Newton's second law of motion, which is formulated as F = ma (Force equals mass times acceleration). Since the accelerations are identical, and we are comparing two different bodies, the one with the larger mass will require a larger force to achieve the same acceleration. So, the correct answer is B) Heavier.