some students ran back to the dormitory,magazines__under their arms.A,was held B,held C,holding

题目

some students ran back to the dormitory,magazines__under their arms.A,was held B,held C,holding
some students ran back to the dormitory,magazines__under their arms.
A,was held
B,held
C,holding
C选项表示正夹着杂志跑不对吗?
还有AB同样表被动,为什么选B不选啊?

答案