help me please

Read the paragraph from the section "Biological Oceanography."

Biological oceanographers study how each of the sub-disciplines of oceanography work to influence the distribution and abundance of marine plants and animals. They also research how marine organisms behave and develop in relation to their environment. Marine biologists and scientists who work in fisheries are examples of biological oceanographers.

Which two words could BEST replace "distribution" and "abundance" in this paragraph?

A
placement; wealth
B
division; bundles
C
sequence; health
D
location; quantities