Fill in the blank with an appropriate Preposition.

Alexander profited ____ the dissensions of the Rajas of Punjab.

by

The correct answer is Option (3) → by

"Alexander profited by the dissensions of the Rajas of Punjab."

Here's an explanation:

- "By" in this context indicates the means or method through which Alexander profited. It suggests that the dissensions of the Rajas of Punjab were the cause or instrumentality of Alexander's profit.
- "For" wouldn't be appropriate because it typically indicates purpose or benefit, which doesn't fit the context of how Alexander profited.
- "With" doesn't convey the idea of benefiting from something as directly as "by" does.
- "Of" would imply possession or association, which doesn't fit the meaning of the sentence.