According to Ashokan edicts, how many years after becoming the king did Ashoka wage war on Kalinga?

Eight

The correct answer is Option 3- Eight

According to Ashokan edicts, Ashoka waged war on Kalinga eight years after becoming the king.

This is stated in the following passage from the Rock Edicts of Ashoka:

Eight years after becoming the king, the Beloved-of-the-Gods conquered Kalinga. One hundred and fifty thousand were deported, one hundred thousand were killed and many more died (from other causes). After the Kalingas had been conquered, the Beloved-of-the-Gods came to feel a strong inclination towards the Dharma, a love for the Dharma and for instruction in Dharma. Now the Beloved-of-the-Gods feels deep remorse for having conquered the Kalingas.

The Kalinga War was a brutal and bloody war, and it had a profound impact on Ashoka. It is believed that the war led to Ashoka's conversion to Buddhism and his adoption of a policy of non-violence