Final answer:
Flexor digitorum superficialis and flexor digitorum profundus are the flexor muscles on the dorsum of the hand that are innervated by both the median and ulnar nerves. Hence, A and B are correct.
Step-by-step explanation:
The flexor digitorum superficialis and flexor digitorum profundus are the flexor muscles on the dorsum of the hand that are innervated by both the median and ulnar nerve.