Your first two options are both correct. You can say either 'two hours' drive' or 'a two-hour drive'. The third one isn't right. NB This is something that even native English speakers get wrong sometimes! A lot of native speakers aren't sure how to use apostrophes and hyphens.

I wouldn't hyphenate "two-hours" but two hours and a two hour drive are both correct depending on the sentence, for example you would say "it is a two hour drive from here" but you could also say "it's two hours drive from here" the first example "it's a two hour drive from here" sounds a bit more formal to my ear but both are correct.