Once a b cell has been activated by a specific antigen (an antigen binds to an antigen receptor on the b cell membrane), it will divide, making many copies of itself. this process is known as

The answer is Clonal selection.

In a pre-existing group of lymphocytes, in this case B cells, a specific antigen activates the B cell because it bonded to a specific region of the B cell. This will induce the B cell to proliferate, producing  clones of itself, and each clone will produce antibodies. Then the antibodies will bind to the antigen making it easier for to Antigen to be eliminated.

The right answer is c.sandstone.