What question out of the who, what, when, where, why, and how did "Because I missed my bus" respond to?
Who are you late? Because I missed my bus.
What are you late? Because I missed my bus.
When are you late? Because I missed my bus.
Where are you late? Because I missed my bus.
How are you late? Because I missed my bus.
^^^All of these options don't make sense when you read it out loud. This is because they don't fit the response of "Because I missed my bus."
The answer is:
Why are you late? Because I missed my bus.
Hope this helped!
~Just a girl in love with Shawn Mendes