Answer: The correct answer is A. No greater muscle force can be generated and the muscle has reached maximal tetanus tension. Once the maximum stimulus frequency is reached, the muscle is unable to produce any additional force and has reached its maximal contraction potential.
Step-by-step explanation:
The maximum stimulus frequency refers to the highest frequency of electrical stimuli that can be applied to a muscle before it reaches its maximum contraction force, known as maximal tetanus tension.
When a muscle is stimulated at a frequency that is equal to or higher than the maximum stimulus frequency, the muscle fibers are unable to relax completely between contractions. This leads to a sustained contraction known as tetanus. At this point, no greater muscle force can be generated because the muscle is already contracting as forcefully as possible.