Final answer:
Dr. Watkins' observation of high protein levels in cells suggests a large number of ribosomes, which are responsible for protein synthesis.
Step-by-step explanation:
When analyzing the results of a lab report, Dr. Watkins concludes that high levels of proteins being produced by the patient's cells most likely indicate a large number of ribosomes. The organelle that is responsible for producing high levels of proteins in cells is ribosomes. Ribosomes are the cellular structures responsible for protein synthesis. They are found in practically every cell and are particularly abundant in cells that require a lot of protein production, such as immature red blood cells. Ribosomes are essential for protein synthesis and are found in virtually every cell, being especially abundant in cells that produce large amounts of protein. Therefore, the correct answer is D) Ribosomes.