问题：
[单选题]You are in charge of a towing vessel that operates exclusively on inland waters. You regularly tow barges that provide services (cargo lighters，fuel barges，etc.) to foreign flag vessels in port. What will be accepted as proper credentials for you and your crew? （）
A、No credentials are required since you operate on inland waters only
B、Social Security card
C、State driver's license with photo ID
D、Merchant Mariner's Document
参考答案：
D
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