When Traveling Through Sieve Tube Elements,dissolved Sugars and Other Substances

Multiple Choice

When traveling through sieve tube elements,dissolved sugars and other substances move from sources to sinks by traveling

A) vertically,through the open ends of each sieve tube.
B) vertically,through sieve plates formed of plasmodesmata.
C) horizontally,from phloem cells oriented adjacent to each other.
D) horizontally,by combining with xylem so the products move together.
E) horizontally,from companion cells on one side to companion cells on the other side.