Answer:
Option D, substantial
Step-by-step explanation:
As per the recent psychological and neuropsychological researches, it is clear that executive functions in an individual such as cognitive thinking, responses, memory, control abilities, intelligence, perceptual speed etc. depend on the genetic origin of an individual. This means that an individual also inherit psychological traits along with biological traits from their ancestors. This is the reason why every individual vary from each other in abilities to control their own thoughts and actions
Hence, option D is correct