The best response is:
d. Plants have a larger vacuole
This statement is correct as plant cells typically contain a large central vacuole that stores nutrients and waste products, which is much larger than the vacuoles found in animal cells. The other options are incorrect: plant cells do not uniquely have rough endoplasmic reticulum, both plant and animal cells do not have chloroplasts (only plant cells do), and animal cells do not have cell walls.