Which of the following is an organic compound? Remember, a key feature of an organic compound is the presence of carbon connected to carbon and also carbon connected to hydrogen.
If we take a look at A we don't have any carbons, we have no hydrogens. The same thing can be said for B&C. The answer here is option D. That's because we have carbon hydrogen bonds. We have carbon carbon bonds. We also have carbon connected to this OH group.
But remember, the fundamental thing we have to think about when it comes to many organic compounds is the presence of carbon carbon bonds and carbon hydrogen bonds, which this has.