Which of these conditions would increase the rate of erythropoiesis?

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All of the conditions listed can increase the rate of erythropoiesis. Low oxygen environments, such as at high altitudes, stimulate the production of erythropoietin (EPO) from the kidneys, which prompts the bone marrow to produce more red blood cells. Increased physical activity increases the demand for oxygen and triggers the release of EPO. Loss of blood (such as from bleeding) stimulates the bone marrow to produce more red blood cells to replace the loss. Increased hormone secretion from the kidneys also stimulates erythropoiesis through the release of EPO.

Which of These Conditions Would Increase the Rate of Erythropoiesis