You Are Examining a Plant That Has Recently Been Discovered,a

You are examining a plant that has recently been discovered,a plant that does not fit into either the eudicots or the monocots.You notice that its leaves have small openings,and that when these openings close,photosynthesis stops.You guess that the cells on either side of these pores are

A) sieve tube cells.
B) vascular cells.
C) companion cells.
D) pith cells.
E) guard cells.