Explanation:

- Option 1: Chandragupta and Dhana Nanda

- Chandragupta Maurya founded the Maurya Empire.

- Dhana Nanda was the last ruler of the Nanda dynasty.

- They are not known to have fought at the Battle of Hydaspes.

- Option 2: Alexander and Porus

- The Battle of Hydaspes was fought between Alexander the Great and King Porus of the Paurava kingdom.

- It took place in 326 BC on the banks of the Hydaspes River.

- Option 3: Ashoka and Mahapadmanabha

- Ashoka was one of India's greatest emperors from the Maurya dynasty.

- Mahapadma Nanda was the founder of the Nanda dynasty.

- There’s no record of them having battled at Hydaspes.

- Option 4: Mihirakula and Yasodharman

- Mihirakula was a ruler of the Alchon Huns.

- Yasodharman was a ruler from central India who defeated Mihirakula.

- Their conflict did not involve the Battle of Hydaspes.