Explanation:

Here’s the thing: the battle you're talking about is pretty famous in ancient history. Let’s break down the options:

- Option 1: Hydaspes

This is the correct answer. The Battle of Hydaspes was fought in 326 BC between Alexander the Great and King Porus, right by the River Jhelum (then called Hydaspes) in what is now Punjab, Pakistan. Big deal, because it was Alexander's last major battle before his army said, “enough.”

- Option 2: Tarain

That’s actually way later, in the 12th century AD, between Prithviraj Chauhan and Muhammad Ghori. Totally different era and context.

- Option 3: Panipat

This refers to a series of three major battles in Indian history, starting from 1526 AD. Huge events, but not Alexander’s time or fight.

- Option 4: Plassey

Fast forward to 1757. This battle set up British rule in India, involving the British East India Company and Siraj-ud-Daula. Alexander was long gone by then.