Answer:
occurs when the goal is challenging but not impossible.
Step-by-step explanation:
A goal can be defined as the desire to meet specific targets over a period of time.
Generally, there are different types of goals and these includes;
1. Short-term goal: this type of goal are usually actualized (achieved) in a week, months or within a year.
2. Intrapersonal goal: a goal that is personal and fixed. This type of goal is peculiar to an individual and might include an action plan or desire to stop a behavior, start a task, improve on an aspect of your life, etc.
3. Normative goal: it's dependent on the achievement of others. It is typically based on an evaluative standard.
4. Long-term goal: it's to be achieved in the distant future. This type of goal are usually in a long period of time such as five (years) and more.
The optimal level of difficulty of a goal occurs when the goal is challenging but not impossible.