In the psychological context of 'Plateaus of Learning', which of the following psychological factors or conditions is considered the primary cause of learning plateaus arising during the learning process?

From the perspective of Child Development and Pedagogy, a 'Plateau of Learning' refers to a state where progress in the learning process halts temporarily, and the learning curve becomes completely horizontal.

Key Psychological Causes:

• Fatigue: Physical and mental exhaustion significantly reduces the learner's cognitive capacity.
• Lack of Motivation: Decreased interest and motivation hinder further progress.
• Interference: Old habits or knowledge interfering with the acquisition of new concepts.

Therefore, option 'a' accurately describes the primary psychological factors contributing to learning plateaus.