Grammar and Understanding

Imagine waking up after dreaming about a horrible plane crash. The next day you plan to make a plane journey that you have planned long before. Will you get on the plane? A survey shows that you may not cancel your trip but your dream will probably influence your thoughts just as if there had been a real plane accident.

The sentence "you may not cancel your trip" has a similar meaning to:

a) You are prohibited to cancel your trip.
b) you are not allowed to cancel your trip.
c) you might not cancel your trip.

d) you will not cancel your trip.

e) you can not cancel your trip.