Answer
D.
Work Step by Step
A. and B. are xylem, not phloem, cells, and C. is a support, not a transport, cell in the phloem.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.