Final answer:
The severity level characterized by trouble reasoning is Severe. A learning disability is a neurological disorder, and stimulants are often used to treat ADHD.
Step-by-step explanation:
In the classification of difficulty levels, the level characterized by trouble reasoning in individuals is c) Severe (trouble reasoning). This may manifest as significant difficulties in cognitive processes and the ability to think logically or solve problems.
Regarding the topics within the framework of mental health and neurodevelopmental disorders:
- A learning disability is b) a neurological disorder. This type of disorder affects the brain's ability to receive, process, store, and respond to information.
- According to the Eysencks' theory, people who score high on neuroticism tend not to be 'calm' or 'stable' but rather may experience frequent emotional instability and anxiety.
- Medications often used to treat patients with ADHD, a neurodevelopmental disorder, are c) stimulants. Stimulants can help increase attention and focus by balancing neurotransmitters in the brain.