The correct option is
C Several ribosomes attached to a single mRNA
Sometimes, the multiple ribosomes may attach to the same mRNA at different points. Such an arrangement is called as a
polysome. Multiple ribosomes translate the mRNA into multiple polypeptides simultaneously.
![Image result for polysome](https://search-static.byjusweb.com/question-images/byjus/302042_d3efa43252239d1e5caacdac1b20deff0a001b4220170821-28538-1f4tyfz.jpg)