Lifeboats designed to carry 60 to 100 persons must be either ___ or ___.

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The main idea is that large lifeboats (designed to carry 60 to 100 people) must have a propulsion option that works even if the engine isn’t available. Regulations require either a hand-propelled system using Fleming gear or a motor-propelled system. Fleming gear is a manual propulsion device that lets the crew drive the lifeboat by turning a crank to operate the propeller, providing a reliable backup when power isn’t available. Motor propulsion covers engines as the alternative.

So this answer is best because it lines up with the rule that both manual propulsion (via Fleming gear) and motor propulsion are acceptable options. The other choices miss one side of the requirement: the manual option is specified as hand propulsion with Fleming gear, not just any Fleming gear alone, and the option “rowing propelled” isn’t the standard term used to describe the sanctioned manual mechanism.