The Tirukkural, an ethical and philosophical text, is authored by:

Ilango Adigal
Sillapathikaram
Thiruvalluvar
Kamban

The correct answer is: c) Thiruvalluvar.

Thiruvalluvar was a Tamil poet and philosopher who lived in the 1st century CE. He is considered one of the greatest Tamil literary figures and is best known for his work, the Tirukkural. The Tirukkural is a collection of 1330 couplets that deal with a wide range of topics, including ethics, morality, love, and wealth. It is considered one of the most important texts in Tamil literature and has been translated into many languages.

Ilango Adigal was a Tamil poet who lived in the 3rd century CE. He is best known for his work, the Silappadhikaram. The Silappadhikaram is an epic poem that tells the story of Kannagi and Kovalan. It is considered one of the greatest Tamil literary works and has been translated into many languages.

Kamban was a Tamil poet who lived in the 12th century CE. He is best known for his work, the Ramayana Kandaramayanam. The Ramayana Kandaramayanam is an epic poem that tells the story of Rama and Sita. It is considered one of the greatest Tamil literary works and has been translated into many languages.

D) is incorrect because Kamban is not the author of the Tirukkural.