Which statement correctly identifies an energetically active transport process?

Which statement correctly identifies an energetically active transport process?

• A. Simple diffusion moves substances down their concentration gradient without energy.
• B. Facilitated diffusion uses energy to move substances down their gradient.
• C. Active transport uses energy to move substances against their gradient via pumps or co-transporters.
• D. Osmosis moves water across membranes without energy.

Answer: (C)