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I think the correct answer from the choices listed above is the third option. The barrel of a gun is also known as bore. The barrel is the metal tube which the bullet is fired and the bore is the inside of the barrel. It is the one closest to the barrel so it must be the answer.

Answer:

The barrel is also known as the Bore.

Explanation:

Rifle- is a large type of gun, not a part of one.

Caliber- is the type of bullet fired from a gun, or the size of the bullet.

Gauge- used to show magnitude, amount, or contents of something, typically with a visual display.

None of these except bore would make sense.