John had bought a telescope. We decided to use it to look at the meteor shower. As we stood on the balcony, he tapped my shoulder and handed me . . . . . . . . telescope.

When specific entity is talked about 'the' article is used. In the first sentence, 'a' is used before 'telescope' because it's mentioned for the first time. In the last sentence, the correct answer should be 'the' because by then both the speaker and the listener know the identity of this noun. Hence Option C is the correct answer.