Which of the Following Are True of LDC Population Patterns

Which of the following are true of LDC population patterns?

A) Significant territorial expansion fueled their rapid transitional population growth.
B) Their birth and death rates are now comparable to those of the MDCs.
C) Their death rates were most affected by effective disease-control techniques introduced by outside agencies like the World Health Organization,rather than by internal economic development.
D) All of the above are true.
E) None of the above is true.