Which sport uses the Christmas Tree starting system?

Question: Which sport uses the Christmas Tree starting system?

Options:

---

Correct answer:

---

More games: guess the idiom, infinite pics answers,  guess the emoji.

7 little words

1. Two-door Plymouth model
2. Bruise around the eye
3. Roosting rod 7 Little Words
4. Easy mark 7 Little Words
5. Hockey footwear 7 Little Words
6. Hairstyle 7 Little Words
7. Painter Jackson 7 Little Words
8. 1940s Fairey aeroplane
9. Kind of gull 7 Little Words
10. Insignificant person 7 Little Words