Question: Which of the following sentences is nonsensical?
Options:
- Sentence A: "I am not able to be on duty this morning as I have to pick up my mother at the airport."
- Sentence B: "I am able to be on duty this morning when I have to pick up my mother at the airport."

Please answer this question gradually:
It is not possible for a person to deal with two things at the same time in different places. So the answer is Sentence B.