SAT语法题 P47In the 100-yard relay our team impressed the crowe

SAT语法题 P47
In the 100-yard relay our team impressed the crowed,with each of the members shaving several seconds off her own best time.
A.of the members shaving
B.of the members had shaved
C.of the members was shaving
D.who had been shaving
E.who shaved
A 为什么?我选了E