Answer:
C
Step-by-step explanation:
The type of proteins that are produced by rough ER are "proteins for transport". 
The ribosomes attached to the rough ER create proteins that are then transported to other parts of the cell or to other cells. These proteins can have a variety of functions, such as serving as enzymes or structural components of the cell. The rough ER gets its name from the ribosomes attached to it, which give it a "rough" appearance under a microscope.