Their answer is correct. When tackling these problems, I would try not to focus too much on the alcohol. They have a range from 2-5 ppm and are pretty variable. Instead, you'll notice there are two triplets under 4 ppm, which is demonstrated by the correct answer. Each carbon has 2 H's that split one another creating this, with the carbon attached to the hydroxy group more down field. None of the other answers show this splitting pattern.