Grammer

Hi,

Can you tell us your choice first, please?

Clive

Any of those choices are not the easiest to understand. Of the choices you have, I think "C" would be the most understood.

This might be more effective:
Travellers should get their reservations well in advance if they want to fly during the Christmas holidays.

or to make stronger:

Travellers

"C" is the correct answer. After a modal auxiliary (such as "may," "should," "had better," etc., you ALWAYS use the so-called base form (bare infinitive). By the way, native speakers speak fast; so, they often leave out the "had." E.g., "Travelers better get...." Or they contract when the subject is a pronoun: "They'd better get...." Sincerely, James

Hi Jon and James,
Thanks for your input, but please be aware that we strongly encourage the people who post to answer the question themselves first, before we give them the answer.

But they all soon learn to guess anything at all at random as the correct answer so they don't have to run the gauntlet of moderators asking what their answer is. And someone else always answers regardless -- usually a non-moderator with a wrong answer. Then it's a matter of correcting a multiple muddle. I doubt there's a satisfactory solution.

CJ

We send a jolt of electricity through the keyboard to people who post without at least trying to answer, maybe?

You're rig

Grammar GeekWe send a jolt of electricity through they keyboard to people who post without at least trying to answer

they .. !! 

Grammar Geeka jolt of electricity through the keyboard

You've got my attention now! I like the way you think!

Had better to get

The answer is C — had better get.

CJ