I can see that there is a 5th choice u can choose what is the fifth choice I will answer in the comments
Answer:
I really hope that I’m not wrong but is it on the tarmac? Or flying moon? I am really sorry if I made u get it wrong
I believe the answer is C
I'm not sure what your options are, but here's what I've come up with:
The reason for our tardiness was because we got stuck in traffic.