Preparation of salts — practice question

Which method is used to make the salt copper(II) carbonate?

• AAdd copper(II) oxide to water, then add excess aqueous sodium carbonate. Filter off the precipitate.
• BAdd copper(II) oxide to dilute sulfuric acid, then add excess aqueous sodium carbonate. Filter off the precipitate.
• CAdd copper to dilute hydrochloric acid, then add aqueous sodium carbonate. Filter off the precipitate.
• DAdd copper(II) oxide to excess aqueous sodium carbonate. Filter off the precipitate.