Movement into and out of cells — practice question

Which statement accounts for why a tree’s circumference (girth) is smaller in the middle of the day than it is at night?

• AMineral uptake by the root hair cells decreases during the night because root pressure has decreased.
• BStomata close during the night and there is a build-up of water in the vascular tissue within the stem.
• CThe phloem sieve tubes fill with dissolved solutes because the translocation rate is reduced at night.
• DThere is less tension in the xylem vessels at night because the rate of transpiration is at a minimum.