Final answer:
The phalanges are bones located in both the fingers and toes, with variations in number between the thumbs and big toes compared to the other digits. The option (A) is correct.
Step-by-step explanation:
The phalanges are the bones found in both the fingers and toes. In the hands, the thumb contains a proximal and a distal phalanx, while the other fingers have proximal, middle, and distal phalanges.
Similarly, in the feet, each toe consists of three phalanges, except for the big toe, which has two. These phalanx bones in the digits are long bones that function as levers allow for fine manipulation with the fingers and help sustain the body's weight and balance through the toes. Therefore, option (A) is correct.