What is the consistent delivery of adequate oxygen to the cells?

Perfusion is the consistent delivery of oxygen to cells. Perfusion is the passage of fluid through the circulatory system or lymphatic system to an organ or a tissue, usually referring to the delivery of blood to a capillary bed in tissue. It delivers adequate oxygen to the cells.

i came across this and i found it funny that when you're bored you play hangman on so im going to guess a : )

(a) i got it right on the test