Final answer:
The radial and ulnar arteries are responsible for supplying blood to the forearm and hand, originating from the brachial artery.
Step-by-step explanation:
The radial and ulnar arteries supply blood to the forearm and hand. These arteries are formed at the bifurcation of the brachial artery, with each paralleling its namesake bone. As they reach the carpal region, they fuse together to form the superficial and deep palmar arches that supply blood to the hand, including the digital arteries that nourish the digits. So, the correct answer to the question is: a) Radial and b) Ulnar.