C.
1. B
2. A
3. A
4. A
5. C
6. A
7. C
8. A
9. C
10. D
D.
1. As she started playing seriously at the age of five, she knew nothing about life outside tennis
2. She won a lot of major tournaments, as a result, she became the top player in the world
3. Owing to her arguing with an umpire, she got into trouble with the sport's authorities
4. She sacked her coach so she had to find a new one
5. She did some modelling, which resulted that she earned more than she earned from playing
6. She became too old to stay at the top, therefore, she retired from tennis completely