Movement of Phloem Sap from a Source to a Sink

Movement of phloem sap from a source to a sink

A) occurs through the apoplast of sieve-tube elements.
B) may translocate sugars from the breakdown of stored starch in a root up to developing shoots.
C) depends on tension, or negative pressure potential.
D) depends on pumping water into sieve tubes at the source.
E) results mainly from diffusion.