OG10--69 请教B到底错在哪里？若要用while应该如何改正？

sarahbaby

69. Although she had signed a pledge of abstinence while being an adolescent. Frances Willard was 35 years old before she chose to become a temperance activist.
(A)    while being an adolescent
(B)    while in adolescence
(C)    at the time of her being adolescent
(D)    as being in adolescence
(E)    as an adolescent

问题：解释说B是不符合语法的，想问B错在in adolescence还是错while in adolescence,

yjh880424

http://forum.chasedream.com/GMAT_SC/thread-65352-1-1.html

sarahbaby

谢谢谢谢~~非常感谢！