Acetic acid and not sulphuric acid is essential for acidification of sodium extract for testing sulphur by lead acetate test because
A. sulphuric acid is stronger acid
B. lead acetate is oxidized by sulphuric acid
C. sulphuric acid is expensive
D. lead acetate will react with `H_(2)SO_` to form white ppt. of lead sulphate which will interfere with the test
