An Individual Experiences Abdominal Discomfort After Consuming a Drink Containing

An individual experiences abdominal discomfort after consuming a drink containing milk. A loss of function of which enzyme is most likely responsible for the symptoms?

A) lactase that breaks down the bond between galactose and glucose
B) lactose that breaks down the bond between two glucose molecules
C) maltase that breaks down the bond between galactose and glucose
D) maltose that breaks down the bond between two glucose molecules