Tom, together with his classmates, ______ because of _______ the school rules.

A．was punished, obeying

B．were punished, obeying

C．was punished, breaking

D．were punished, breaking

X线胸片上，有一直径约2.4cm的圆形阴影，边缘光滑锐利，密度较高，内有爆米花状钙化，病人无自觉症状。最可能的诊断为（）

A.肺癌

B.错构瘤

C.炎性假瘤

D.包虫囊肿

E.结核球