Which of the Following Accurately Describes the Structure of a Leaf

Multiple Choice

Which of the following accurately describes the structure of a leaf?

A) stomata can occur on both sides of a leaf
B) in a eudicot, spongy mesophyll is on the same side of the leaf as xylem in the vein
C) the main veins of leaves have both xylem and phloem, but smaller veins have only xylem or phloem
D) palisade mesophyll occurs only in monocot leaves