Under What Circumstance Would Your Body Experience an Increase in Erythropoietin

Under what circumstance would your body experience an increase in erythropoietin secretion?

A) if your hematocrit is elevated above normal levels
B) if you just moved from New York City to start training for a marathon in the 'Mile-High' city of Denver, Colorado
C) after drinking 5 liters of water in just 2 hours
D) if you are suffering from hypertension