1. Which of the following doesn't describe an MDC?

A. It's highly industrialized.

B. It has undergone the demographic transition.

C. It generally experiences replacement reproduction.

D. Its age structure diagram resembles a pyramid.

The correct option is D.

For economically more developed countries, the age structure diagram is usually very evenly distributed. The economically less developed countries are the ones who usually have age structure diagram which resemble a pyramid. MDC are usually highly industrialized and economically rich.