Which of the following is an example of a beneficial mutation? A. a mutation causing uncontrolled cell division in human tissue cells
B. a mutation inhibiting human immunodeficiency virus from entering the host cell
C. a mutation resulting in partial or complete loss of chlorophyll pigments in plants
D. a mutation resulting in a squirrel being born without ovaries

B. a mutation inhibiting human immunodeficiency virus from entering the host cell

I hope this helps.