Tummy First Or Manners?

Say, if you had an appointment at a certain time, and just before you left your office, your friend sms to say he/she is stuck in a meeting and said he/she needed another half an hour. You said ok. You did a bit more work, left ofis, walked to the venue, then waited. He/she did not turn up, you sms; reply "coming now". 10 minutes later, still no shadow of your friend, by then your tummy started to retaliate. What do you do? You have about 40 minutes left before you get back to work.

a) wait for him/her
b) call and tell him/her off
c) sms him to say you will start first
d) none of the above

My Answer: c