Which one of the following classical Indian thinkers has made this argument?
The argument that qualities such as desire and cognition necessarily require an underlying substance, and thus serve as marks to identify that substance (the soul), is attributed to the classical Indian thinker Gotama.
Gotama is the founder of the Nyaya school of Indian philosophy. The Nyaya school analyzes reality through categories like substance (dravya), quality (guna), and action (karma).
This reasoning connects observable qualities to the unobservable substance, the soul.