Question

select the part whose main job is to help ribosomes make proteins. vacuole endoplasmic reticulum chloroplast cytoplasm

Explanation:

The endoplasmic reticulum, especially the rough endoplasmic reticulum which has ribosomes attached to its surface, plays a key - role in protein synthesis. Vacuoles are for storage, chloroplasts are for photosynthesis, and cytoplasm is the jelly - like substance where many cell activities occur but not specifically for helping ribosomes make proteins.

Answer:

endoplasmic reticulum