The 'dark past' is most likely referring to a period of time marked by traumatic suffering. The full line seems to be saying that the 'dark past' taught these people faith. People often only have faith to hang on to in times of suffering. So, I'd say the answer is c.
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D. These reasons and more are why "Taxi Driver" is widely considered a cinematic classic.
Answer:
It contains one independent clause, one dependent clause, and a prepositional phrase
Explanation: