The big fire in Shanghai,believed to_due to the burning of construction materials,caused 58 deaths and destroyed all the belongings of the people there.A.have occurredB.occurC.have been occurringD.be occurringB为什么不行 以及求所有选项的

The big fire in Shanghai,believed to_due to the burning of construction materials,caused 58 deaths and destroyed all the belongings of the people there.
A.have occurred
B.occur
C.have been occurring
D.be occurring
B为什么不行 以及求所有选项的解释

occur 发生；不及物动词
A to have occurred 为动词不定式的完成式,表示一个先于believe而发生的动作.大为先发生,人们后认为.