Which of the following would lead to an increase in cardiac output?

Question

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An increase in preload, or the amount of blood returning to the heart, would lead to stretching of the heart muscle fibers and ultimately an increase in the force of contraction, resulting in an increase in cardiac output. Reduced cardiac contractility (A) would decrease cardiac output. Hypovolemia (B), or low blood volume, would lead to a decrease in preload and subsequently a decrease in cardiac output. Peripheral vascular resistance (C) would increase afterload, or the resistance the heart must overcome to eject blood, and ultimately decrease cardiac output.

Which of the Following Would Lead to an Increase in Cardiac