The correct answer is B. In the cytoplasm of the cell.
In addition to on the rough endoplasmic reticulum ribosomes can be found in the cytoplasm of a cell.
Explanation;
Ribosomes are cellular organelles that functions in making of proteins. They contain special proteins and nuclei acids.
Ribosomes can be found in two different spaces in eukaryotic cells; that is, on the rough endoplasmic reticulum and floating in the cytoplasm of a cell. In the cytoplasm they are not bound to anything as they are in the rough endoplasmic reticulum.