Refer to the Following Paragraph and Accompanying Figure to Answer

Multiple Choice

Refer to the following paragraph and accompanying figure to answer the following question(s) .
-Under what circumstances does membrane transport require energy?

A) wherever large molecules are moved within a cell
B) whenever a solute is moved against its electrochemical gradient
C) whenever an ion moves through a phospholipid bilayer membrane
D) whenever oxygen moves through a phospholipid bilayer membrane