Correct option is D
(A) Turiyavastha refers to the highest state of consciousness, also known as the state of pure awareness, beyond the waking, dreaming, and deep sleep states. It represents non-dual consciousness in Vedanta, where an individual realizes the oneness with Brahman.
(B) Aparvidya refers to empirical knowledge, which is based on sensory experiences and is part of the material world. It is also called lower knowledge in Vedantic philosophy, which pertains to worldly experiences and learning.
(C) Paravidya refers to transcendental knowledge, the higher knowledge, which is related to spiritual wisdom or the knowledge of Brahman (the ultimate reality). It is considered higher knowledge that leads to liberation (Moksha).
(D) Nidhidhasan is the transcognitive realization, a practice of deep meditation and contemplation, typically for internalizing and experiencing higher knowledge. It is a meditative state in which one realizes the teachings of Vedanta directly.