Stroke volume is regulated by:
a. Preload Contractility of the individual ventricular muscle fibers
b. Afterload or the pressure that must be exceeded before ejection of blood from the ventricles can occur
All of these regulate stroke volume

Stroke volume is regulated by:

All of these regulate stroke volume

Explanation:

Both pre-load contractility of the individual ventricular muscle fibers

and after-load or the pressure that must be exceeded before ejection of blood from the ventricles can occur contributes to how stroke volume is regulated.

the correct answer is d, farmer's market

d is the answer hope this