Answer:
The correct answer is letter "A": Grayson is underemployed.
Step-by-step explanation:
Underemployment is the state where the worker is not in full use of their capacity or experience according to the set of skills required for the current job the worker has.
In the example, Grayson is a technician who was laid off. Unfortunately for him, he takes a store stock -where his technical knowledge is not going to be in fully use, just because he needed to secure at least a job.