Which of the following situations correctly represents the phenomenon of test tube baby?

The correct option representing the phenomenon of a “test tube baby” is [B] When the development of the embryo takes place in the test tube.
In the process of in vitro fertilization (IVF), which is commonly referred to as “test tube baby” technology, fertilization occurs externally in a laboratory dish (test tube), where eggs and sperm are combined. After fertilization, the resulting embryo is allowed to develop in the laboratory for a few days before being transferred into the woman’s uterus for further development and implantation. So, while fertilization occurs externally (in the test tube), the subsequent development of the embryo also takes place outside the body, in a controlled laboratory environment.