The bar graph compares the percent of cell volume occupied by mitochondria for several kinds of specialized cells. What can be inferred using this data? A) Heart cells need to be much larger than liver or pituitary gland cells.

B) Heart cells use more energy than liver or pituitary gland cells.

C) Heart cells are more common than liver or pituitary gland cells.

D) Heart cells produce proteins at a lower rate than liver or pituitary gland cells.