Final answer:
Compression of Olivia's inferior vena cava will decrease cardiac output.
Step-by-step explanation:
Compression of Olivia's inferior vena cava would impact cardiac output by decreasing it. The inferior vena cava is a major vein that returns deoxygenated blood from the lower organs and legs to the right atrium of the heart. When the inferior vena cava is compressed, it restricts the flow of blood back to the heart, reducing the amount of blood that can be pumped out of the heart with each contraction. This leads to a decrease in stroke volume and ultimately decreases cardiac output.