Which cytologist demonstrated the role of the endoplasmic reticulum (ER) in protein processing and sorting in a variety of cells in the 1960s?

Correct option is B

The cytologist who demonstrated the role of the endoplasmic reticulum (ER) in protein processing and sorting in a variety of cells in the 1960s was George E. Palade. His pioneering work using electron microscopy helped elucidate the structure and function of the ER, as well as other cellular organelles like mitochondria and the Golgi apparatus, contributing significantly to the field of cell biology. Therefore, the correct answer is: (b) George E Palade