Which of These Is Not a Reason That Aphids Feed

Which of these is not a reason that aphids feed on phloem?

A) Phloem is under positive pressure,so when the aphid pierces a phloem tube,sap is pushed into its mouth.
B) Xylem is under negative pressure,so it would be very difficult to suck the fluids.
C) Phloem contains high concentrations of sugars,as well as some minerals and other nutrients.
D) Xylem contains mostly water and fewer nutrients.
E) In soft herbaceous plants,phloem is more accessible than xylem.