Explanation:

- Option 1: Deneb

- Deneb is a luminous star in the constellation Cygnus.

- It is very far from the Sun, about 2,600 light-years away.

- Option 2: Sirius

- Sirius is also known as the Dog Star.

- It is about 8.6 light-years away from the Sun.

- Option 3: Betelgeuse

- Betelgeuse is a red supergiant star in Orion.

- It is approximately 642 light-years from the Sun.

- Option 4: Proxima Centauri

- Proxima Centauri is part of the Alpha Centauri star system.

- It is about 4.24 light-years away, making it the nearest known star to the Sun.

Correct Answer: Option 4 - Proxima Centauri