Final answer:
Type II fibers from muscle spindles are best at signaling the absolute amount of stretch, as they provide sustained information about the static position of limbs.
Step-by-step explanation:
Muscle spindles are sensory receptors within the muscle that detect changes in muscle length, thus providing information about muscle stretch. They are part of the proprioceptive system that sends signals about limb position and movement to the brain. Ia fibers from muscle spindles are particularly adept at signaling the rate of change of muscle length (dynamic response), as well as the absolute amount of muscle stretch (static response). On the other hand, Type II fibers are more responsive to the absolute magnitude of muscle stretch but have less dynamic sensitivity compared to Ia fibers. The Ib fibers are associated with the Golgi tendon organs which measure muscle tension, and gamma fibers are motor fibers that adjust the sensitivity of the muscle spindles themselves.
When you asked which afferent muscle spindle nerve fibers are better at signaling the absolute amount of stretch, the correct answer is: b) II fibers. These fibers have a sustained response to muscle stretch and are responsible for conveying continuous information about the static position of a limb.