As Part of an Experiment, Researchers Grew Several Different Types

As part of an experiment, researchers grew several different types of cells in the presence of radioactive iodine. After some time had passed, the cells were washed, and the levels of iodine inside the cell were determined. What is the most plausible explanation for why some cells had higher levels of radioactivity after treatment than others?

A) Cells that had high radioactivity levels after treatment contain iodine transporters.
B) Cells that had high radioactivity levels after treatment lack iodine transporters.
C) Cells that had high radioactivity levels after treatment had a mutation in genes encoding iodine transporter proteins.
D) Cells that had high radioactivity levels after treatment lack clathrin.
E) Cells that had high radioactivity levels after treatment lack lysosomes.