Identify the king who was referred to as the 'Piyadassi':

Asoka

The correct answer is Option (1) → Asoka

"...Asoka, is not mentioned in the inscription. What is used instead are titles adopted by the ruler devanampiya, often translated as “beloved of the gods” and piyadassi, or “pleasant to behold”. The name Asoka is mentioned in some other inscriptions, which also contain these titles. After examining all these inscriptions, and finding that they match in terms of content, style, language and palaeography, epigraphists have concluded that they were issued by the same ruler.".