Karnataka Sangeeta Pitamaha:
This title denotes a revered figure in the history and development of Carnatic music.
Purandaradasa’s Contribution:
Considered the Father of Carnatic Music, he formalized the system, including the Mayamalavagowla scale as the basic scale for music instruction.
He composed numerous kirtanas (devotional songs) in simple Kannada, accessible to the common people.
Why other options don't fit
Muthuswami Dikshitar and Tyagaraja are well known figures in Carnatic music, but only Purandaradasa is accredited with the formal structure of the music.
Therefore, Purandaradasa, is celebrated as the Father of Carnatic Music (Karnataka Sangeeta Pitamaha) for his foundational contributions.