Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.
Since we had nothing else to do, we decided to go for a walk.
A.Have nothing else to do, we decided to go for a walk.
B.Since having nothing else to do, we decided to go for a walk.
C.Having nothing else to do, we decided to go for a walk.
D.Because having nothing else to do, we decided to go for a walk.