Organic compound $Z$ contains both an alcohol functional group and a carboxylic acid functional group. When compound $Z$ reacts with magnesium carbonate, it forms a salt with a relative formula mass of $230.3$. Compound $Z$ shows no reaction with acidified potassium manganate(VII). What might compound $Z$ be?
- A2-hydroxy-2-methylbutanoic acid
- B2-hydroxy-2-methylpropanoic acid
- C3-hydroxy-2-methylbutanoic acid
- D3-hydroxy-2-methylpropanoic acid