Choose the sentence which has the closest meaning to the original one.
They decided to go for a picnic though it was very cold.
A.Because it was very cold, they decided to go for a picnic.
B.However cold it was, they decided to go for a picnic.
C.If it had been cold, they would not have gone for a picnic.
D.It was very cold so they decided to go for a picnic.