1. Curling and ice hockey are both Olympic sports. 2. These sports are very demanding. 3. They require practicing for long hours and working as a team. 4. Curling is not as well known as ice hockey, because it just became an Olympic sport in 1998. 5. Luke enjoys curling, and his friend Timothy likes ice hockey.
6. Both boys like to practice in the morning. 7. After they finish practicing, Luke and Timothy talk about their dreams of Olympic gold.

Which is a compound sentence?
A) sentence 2
B) sentence 3
C) sentence 4
D) sentence 5