Select the most appropriate word to Fill in the blank
_________ there were no buses, we had to take a taxi.

Options

A. Even if
B. Hence
C. since
D. Although

Explanation

Since there were no buses, we had to take a taxi. “Since” can be an expression of time, and it can also mean “ because” when used as a preposition. Eg: Since I was ill, I could not come.