Sundaram Balachander has been the main player of which of the following musical instruments?

Veena

The correct answer is Option (3) - Veena

Sundaram Balachander has been a main player of the musical instrument Veena. He was a renowned Indian veena player and filmmaker. Although he played several instruments like tabla, mridangam, harmonium, etc., the Veena was his primary instrument and the one he was most recognized for.