The correct answer is: C. Though
The word “though” is used to introduce a clause that expresses a contrast or contradiction with what has already been said. In this case, the sentence is saying that even though Indian soldiers are generally honest, a few can be bribed.
The other options are not as appropriate in this context. The word “if” is used to introduce a condition or possibility. The word “however” is used to introduce a clause that expresses a contrast or contradiction with what has already been said. The word “as” is used to introduce a clause that expresses a reason or cause.
Here is a rewritten version of the sentence using the word “though”:
Though Indian soldiers are generally honest, a few can be bribed.