Bursluluk sınavı 8. sınıf ingilizce soruları Test 2

Read the message and answer the question.
"Hi Mark, I'm writing to let you know that I'll be 15 minutes late for our meeting. My previous appointment is taking longer than expected. Sorry for the inconvenience. See you soon. Best, Alex"
Why is Alex going to be late?

A) He forgot the meeting.
B) His previous appointment is not finished.
C) He has transportation problems.
D) The meeting time was changed.