A student was studying reactions of metals with dilute NaOH at room temperature. The student took dilute NaOH in four different test tubes and added copper powder to test tube A, zinc dust to test tube B, aluminium powder to test tube C and iron powder to test tube D and observed effervescence in__.

A

Test tubes A and B

B

Test tubes B and C

C

Test tubes C and D

D

Test tubes A and D