Movement into and out of cells — practice question

Which statement concerning the loading of sucrose into companion cells and then into the phloem sieve tube element is incorrect?

• AHydrogen ions and sucrose molecules move into the companion cells using a carrier protein.
• BHydrogen ions are pumped out of the companion cells by active transport.
• CSucrose molecules are carried into the companion cells down the concentration gradient for sucrose.
• DSucrose molecules move from a companion cell into the sieve tubes of the phloem through plasmodesmata.