Final answer:
The statement that the upper limbs are more mobile but less stable as compared to the lower limbs is true. This is due to the greater range of motion provided by the shoulder joint and pectoral girdle, contrasted with the stability of the lower limbs necessary for locomotion.
Step-by-step explanation:
The question relates to the mobility and stability of the upper and lower limbs in humans. The correct statement is: The upper limbs are more mobile but less stable as compared to the lower limbs. This is true because the pectoral girdle and shoulder joint offer a greater range of motion to the upper limbs, but this also introduces a greater potential for instability. In contrast, the bones of the lower limbs are more adapted for weight-bearing, support, and stability, which is necessary for body locomotion such as walking or running. Thus, option (a) 'True' is the correct answer.
Another point to consider is the mobility of the joints. A more mobile joint is typically less stable, exemplified by the shoulder joint (very mobile with a wide range of movements) compared to the carpal bones in the wrist (more stable but less mobile).