Travellers are advised to take out insurance. Their luggage may go astray.
A.Travellers should take out insurance if their luggage goes astray.
B.Travellers should get insurance, or else their luggage may go astray.
C.Travellers are advised to take out insurance in case their luggage goes astray.
D.Travellers had better buy insurance as a precaution against their luggage go astray.