SAT语法.选C.求具体解析.

题目

SAT语法.选C.求具体解析.
In 1977 Tracy Austin became the youngest tennis player to win a professional ( ).
A.tournament when she captured a title in Oregon aged 14 years
B.tournament aged 14 years when she captured a title in Oregon
C.tournament when,at the age of 14,she captured a title in Oregon

答案