求一道SAT语法题：The development of bebop is attributed in large pa

求一道SAT语法题：
The development of bebop is attributed in large part to Dizzy Gillespie and also saxophonist Charlie Parker,( and their unique styles helped to contribute to and typified the bebop sound.)
B.their unique styles contributed to and typified the bebop sound
E.the bebop sound was helped by the contributions of their unique styles and typified it