Key: 1. A notched and grooved, usually metal implement that is turned to open or close a lock.
2. A crucial element
3. Å set of answers to a test.
4. A device, such as a wedge or pin, inserted to lock together mechanical or structural parts. Look at the dictionary entry.

Which is the best meaning for key as it is used in paragraph two?

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4 A device, such as a wedge or pin, inserted to lock together mechanical or structural parts. Look at the dictionary entry.

Explanation:

inside of a lock there are pins that need to be lifted before the Dore or object can be opened, therefore we use a key that is groved and shaped in different ways so it can slide easily in and out

he correct answer is choice c. promoters of ufc events were eager to work with state athletic commissions, without public pressure being a necessary inducement.