Answer: expectancy
Step-by-step explanation:
The option that describes Emily's belief about exerting a high level of effort is "expectancy".
Expectancy theory, simply suggests that the behavior of people are motivated as a result of the results that they expect.
Therefore, Emily's belief that a high level of effort will result in a successful performance in her online teaching shows that she's motivated based in what she wants to achieve which is what the expectancy theory entails.