Under What Circumstances Does Membrane Transport Always Require Energy

Multiple Choice

Under what circumstances does membrane transport always require energy?

A) whenever molecules are moved that are too large to pass through the phospholipid bilayer membrane
B) whenever a solute needs to be moved from low concentration to high concentration through a phospholipid bilayer membrane
C) whenever a solute is charged,such as an ion,and is moved through a phospholipid bilayer membrane
D) whenever a molecule is polar and is moved through a phospholipid bilayer membrane