The 'Prayag Prashasti' was composed by the court poet of which of the following rings?

Samudragupta

The correct answer is Option (3) → Samudragupta

The "Prayag Prashasti" was indeed composed during the reign of Samudragupta, the great Gupta emperor who ruled from around 335 to 375 CE. This inscription is an important historical document that provides insights into the achievements and conquests of Samudragupta. The term "Prayag" in the title refers to modern-day Allahabad, where the inscription was found. The "Prayag Prashasti" was authored by the court poet of Samudragupta, Harisena. This inscription celebrates Samudragupta's military exploits and accomplishments during his rule. It is considered one of the most valuable sources of information about the Gupta dynasty and its ruler, Samudragupta, who was known for his extensive conquests and contributions to the Gupta Empire's growth and prosperity.

So, the correct option is [3].