Assuming That Hamburger Is an Inferior Good, an Increase in Consumer

Assuming that hamburger is an inferior good, an increase in consumer income, other things being equal, will cause a(n) :

A) upward movement along the demand curve for hamburger.
B) rightward shift in the demand curve for hamburger.
C) downward movement along the demand curve for hamburger.
D) leftward shift in the demand curve for hamburger.