Read the passage: 'The Navy's submarine fleet operates silently beneath the ocean surface, gathering intelligence and projecting power without detection. Submariners undergo rigorous training to manage complex systems in confined spaces under extreme pressure. Their missions often last months, requiring psychological resilience alongside technical skill.' What is the main idea?
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A
Submarines are the most powerful naval vessels.
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B
Submarine service demands both technical expertise and mental fortitude.
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C
Submariners spend months away from their families.
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D
The Navy uses submarines primarily for intelligence gathering.