Choose the Correct Answer from the List Below

Choose the correct answer from the list below. Not all of the answers will be used.
-____________: This method of studying hemoglobin monitors changes in magnetic fields during the binding of oxygen.

A) cooperative
B) oxygen
C) fMRI
D) carbamate
E) histidine
F) hyperbolic
G) myoglobin
H) bicarbonate ion
I) sickle-cell anemia
J) protoporphyrin
K) fetal
L) carbonic acid