Final answer:
Inhibition of the baroreceptor reflex would affect the regulation of all but cardiac rate. The correct answer is A).
Step-by-step explanation:
Inhibition of the baroreceptor reflex would not allow proper regulation of all but A. cardiac rate. The baroreceptor reflex is a neural control mechanism that helps regulate blood pressure. When blood pressure increases, the baroreceptors detect the increased stretch and initiate action potentials at a higher rate. This leads to responses that maintain homeostasis, including adjustments to stroke volume, respiratory rate, and blood pressure. However, the baroreceptor reflex does not directly regulate cardiac rate.