Sugars Can Travel All Throughout a Plant

Multiple Choice

Sugars can travel all throughout a plant.How do they "know" where to go?

A) Phloem transport proteins carry the sugar molecules and bind to sugar receptors on cells where they are needed.
B) Like diffusion down a concentration gradient,sugar flows from source to sink.
C) Sugar flows by gravity from the leaves to the roots.
D) Sugar adheres to water molecules and is pulled up by transpiration.