If the courts feel that there is just cause, in a complaint by a client organization, they may file one of these against a federal agency.

I think that you forgot to give the options along with the question. I would answer the question based on my knowledge and hope that it helps you. If the courts feel that there is just cause, in a complaint by a client organization, they may file subpoena against a federal agency. 

It was mostly "b. Food shortages" that was an immediate cause of the 1917 revolution in Russia, since the monarchy in Russia before this time was highly extractive.