JEE Main 2018 Chemistry question

In the leaching method, bauxite ore is digested with a concentrated solution of NaOH that produces 'X', when CO gas is passed through the aqueous solution of 'X', a hydrated compound 'Y' is precipitated. 'X' and 'Y' respectively are -

• (A)Na[Al(OH)] and Al(CO) . xHO
• (B)Al(OH) and AlO . xHO
• (C)NaAlO and Al(CO) . xHO
• (D)Na[Al(OH)] and AlO . xHOCorrect