The correct option is A No change
Adverbs of Duration are generally placed at the end of a sentence, like in the given one.
The given sentence ends with the adverb of duration, 'long', hence it requires no change and option A is correct.
Options B, C and D are incorrect because the adverbs are not placed at the end. In B, it modifies 'out', in C it modifies 'you' and in D it is placed in front, they make the sentences grammatically incorrect.