The body produces antibodies complementary to foreign antigens. The process by which the body comes up with the correct antibodies to a given disease is most like .

The question is incomplete as it does not have the options which are:

Going to a shoe store and trying on shoes until you find a pair that fits

Explanation:

Antibodies are the immunoglobulin molecules secreted by the B cells which help the body providing the immunity as they interact with the antigen and help immune system to produce a response.

The variety of the B cells are produced by the body in response to different antigens which produce different type of antibodies. This interaction of antigen and antibodies is known as the complementation and just appear like if you are going to a shop to buys a pair of shoes and tries different shoes  to find the best shoe of best size.

Thus, the selected option is correct.