An investigation involves determining which metal is better for making pots that will cook food faster. Which is the best hypothesis to use for this investigation?

A useful hypothesis connects the result being tested—how quickly the metals heat—with the investigation’s goal: choosing a pot material that cooks food faster. Choice D predicts that if copper heats up faster than iron, it will be better for making pots. Choice C focuses on whether conductivity makes copper heat faster, rather than directly linking the heating result to which pot material is better.

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