According to Ausubel, the knowledge of a particular subject at any given time and how well organized, clear and stable that knowledge is, it is called -

Correct option is D

Answer: (d) Cognitive Structure.
Explanation:
Ausubel emphasized that meaningful learning occurs when new information is linked to existing cognitive structures. Cognitive structure refers to the organized, clear, and stable knowledge a learner already possesses about a subject. Cognitive bias, dissonance, and distortion are unrelated to Ausubel's theory.