Option 1 -> "Intellectual" refers to mental processes involving reasoning, thinking, and understanding—directly synonymous with cognitive.
Option 2 -> "Physical" relates to the body and bodily functions, not mental processes.
Option 3 -> "Mechanical" pertains to machinery or automatic/routine actions, not mental cognition.
Option 4 -> "Emotional" concerns feelings and emotions, which are distinct from cognitive functions.
Hence, Option 1: intellectual -> Cognitive and intellectual are synonymous terms that both describe mental faculties involving thinking, reasoning, learning, and problem-solving. The sentence emphasizes improving these mental capacities. -> correct