Respuesta :
Gave, it should be:
You are happier if you give up that annoying habit.
You are happier if you give up that annoying habit.
The answer here is actually quite obvious, considering the poor spelling and all.
The answer would be D; You are happier if you gave up that annoying habit.
To make this sentence sound slightly better, lets change some things so you can see the difference.
> I would be happier if you gave up that annoying habit.
> They may be happier if you gave up that annoying habit of yours.
Just 2 different ways to see that sentence, but do they sound any better? Please let me know if I'm incorrect about this answer or confusing you.