Water and minerals move up the xylem because of a vacuum created by
a gravity b evaporation c photosynthesis d glucose production

The right answer is B) evaporation

Explanation:

Transpiration occurs at the leaf surface which is the loss of water due to the evaporation. This phenomenon works as trigger of water and mineral movement above to the xylem. Due to the evaporation of water at the leaf, negative pressure is created at the surface of leaf. Tension is produced which results in the pull of water from roots up to the xylem vessels.  

not clear

level 4 to level 2 : ))