Cardiac output question

[Phloston]

When I first saw this question, I chose A, and although I knew it couldn't have been exercise because the shifts of the CO and VR curves would have been upward-left- and left-shifted, respectively, in that case, I changed my answer to it anyway because I second-guessed myself and said, "there's no way a blood transfusion would increase CO by ten litres / minute." Unless I'm just crazy.

In other words, I'm aware that the other answer choices don't work, but is there something wrong here with this picture given that the CO increased by that much?

(The question is small because SDN has size-limits, but press Ctrl+ to make it larger)

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[chaotic mind]

I guess they didn't take the change in contractile force of the heart(which would compensate the increased volume) into account.
It might be an experiment where they cut off the baroreceptor reflexes.the question doesn't specify its an intact human.So increased blood volume would increase the contractile force of the heart via Frank Starling mechanism....

 

[Phloston]

I guess they didn't take the change in contractile force of the heart(which would compensate the increased volume) into account.
It might be an experiment where they cut off the baroreceptor reflexes.the question doesn't specify its an intact human.So increased blood volume would increase the contractile force of the heart via Frank Starling mechanism....

Thanks for the input.