Mr. Cantrell's science class is conducting an investigation to observe the differences between plant and animal cell organelles. The students will observe an onion cell under one microscope, and an animal cell under another microscope. What should students observe as being similar in the onion cell slide and the animal cell slide?

A. Both cell types have a nucleus.
B. Both cell types have a rigid cell wall.
C. Both cell types have large vacuoles.