Phloem Sap Is a Concentrated Solution Consisting Mainly of Sucrose

Phloem sap is a concentrated solution consisting mainly of sucrose. This is because sucrose

A) is a non-reducing sugar and so does not modify other compounds such as proteins during transport.
B) is easily converted to other sugars such as raffinose and mannitol which are metabolically active.
C) maintains the high negative pressure required for transport of assimilates.
D) is able to diffuse through the cell membrane and enter cells for energy.
E) is readily taken up by the roots.