Final answer:
The statement is true as expectancy theory suggests that an individual's expectancy for achieving high performance is tied to their belief in their own abilities, similarly emphasized by the concept of self-efficacy. The correct option is a.
Step-by-step explanation:
The statement is true. In expectancy theory, the strength of a person's expectancy is indeed based on how strongly they believe they can achieve high performance in a task.
This is linked to the concept of self-efficacy, which is an individual's belief in their capability to complete a task. Various theories of motivation, such as those proposed by Bandura and others, suggest that believing in one's own abilities (self-efficacy) can significantly impact their motivation and behavior.
If a person believes that they can achieve high performance, they are more likely to be motivated to take on and persist through challenging tasks. The correct option is c.