Good evening sir.

Please explain it sir.

Answer is 3rd option.

Good evening! It seems like you're referring to a specific question or topic, but I don't have the details about what "it" is. If you could provide more context or specify the question you're asking about, I'd be more than happy to explain it thoroughly. Whether it's a concept in math, science, literature, or any other subject, just let me know, and I'll break it down for you!