Certainly, here's the reasoning for the correct statements:

(A) Naths, Jogis, and Siddhas were indeed religious cults that emerged outside the orthodox Brahmanical framework. These groups often had unique beliefs and practices that deviated from mainstream Brahmanical traditions.

(B) Many leaders of these cults did belong to artisanal groups. Unlike traditional Brahminical society, where religious authority was often associated with birth and caste, these cults often attracted individuals from diverse social backgrounds, including artisanal groups.

On the other hand, the incorrect statements are:

(C) The leaders of these cults did not accept unquestioned authority of the Vedas. In fact, one characteristic feature of these cults was their rejection or reinterpretation of orthodox Vedic traditions.

(D) The language of their expression was typically not literary Sanskrit. These religious cults often used regional languages and dialects, making their teachings more accessible to the common people. Literary Sanskrit was associated more with the elite and scholarly class, not with these alternative religious movements.

So, the correct option is [4].