Artificial insemination is defined as:

A) placing semen into the vagina for conception.
B) using artificial semen.
C) using eggs fertilized in a test tube.
D) placing fertilized eggs into a uterus.

Artificial insemination involves placing semen, either from a partner or a donor, directly into the vagina to increase the chances of conception. It does not involve the use of artificial semen or fertilization in a test tube, nor does it involve placing fertilized eggs into a uterus.