Mammals whose young develop in a pouch on the mother’s body are called

A. placental mammals.
B. monotremes.
C. marsupials.
D. gymnosperms.

The correct answer is C. Marsupials. Marsupials are a group of mammals that give birth to relatively undeveloped young, which then crawl into a pouch on the mother's body to continue their development.

To answer this type of question, you can use your knowledge of biology and animal classification. Alternatively, you can also use a search engine to find the answer. In this case, by searching for "mammals whose young develop in a pouch on the mother's body," you would quickly find that the correct answer is marsupials.