Which of the Following Events Will Occur in Response to Gravitrophism

Which of the following events will occur in response to gravitrophism?

A) Because of the change in the plants position it will have sediments of statoliths (amyloplasts containing starch granules) settle towards the lower side of the stems and roots and come into contact with the cytoskeletal elements.
B) The stems on the shady side of the plant will elongate due to the presence of auxin.
C) The tendril of the plant will coil around any type of substrate that it comes into contact with.
D) The guard cells will swell with water due to an increase in sodium ions which will cause the plant to grow upright.