Answer:
I think the answer is C
Explanation:
You shouldn't over continue to play even though it still hurts which gets B out of the way. You don't need to stop playing tennis completely because when you can get better you can play so it's not D. And only playing once a week could still cause injuries.
Answer:
Ignition sources
Explanation:
Lightning
Smoking
Electrical and mechanical sparks
The knife, because its a knife