Answer:
D.
Explanation:
Microsleeps occur when one has not had enough sleep. One is unaware they're having microsleeps, but they happen.
The correct answer in this case is "we"
Us is also correct but in that case the sentence would not be an elliptical one. If you use "we" then the sentence is both correct and elliptical which fits the description of the question.
Answer:
The main reason a person becomes a supervisor is work-related knowledge.
Explanation: