Movement into and out of cells — practice question

For sucrose to be loaded into the phloem, it must move from mesophyll cells into a companion cell and then on into the phloem. Which row gives the relative sucrose concentrations in each cell type so that this process can occur?

• Amesophyll cell 5; companion cell 10; phloem sieve tube element 15
• Bmesophyll cell 5; companion cell 15; phloem sieve tube element 10
• Cmesophyll cell 15; companion cell 10; phloem sieve tube element 5
• Dmesophyll cell 15; companion cell 5; phloem sieve tube element 10