It's a very long sentence with a lot of information, but it is still only a simple sentence (option b): it has only one verb (taught). In order to qualify as a complex or compound-complex sentence, it would have to have at least 2 phrases, each with a different verb.
Answer:
Stop working till their demands were accepted.
Explanation:
Qjajajnanananansn wnanannansnanwnqnwnwnw
