And looking out of the windscreen , we saw something I ' ve never seen before : a sort of limp sausage - shaped cloud sticking out of the side of a thunderhead , hanging down towards the Shannon Estuary . It looked like a cloud with a ponytail . Odd thing . The twisting of the tip hanging down made it more obvious , though : it was a tornado !
According to the above context, choose the best option to answer the following question.
Question: What may have caused the tornado ?
Options:
A. They were having a severe thunderstorm .
B. They were having a storm while it was cold outside .
C. None of the above choices .
D. The wind had been strong that day .


A