Arrange the following metal in the decreasing chemical activity series? (i) Potassium (ii) Magnesium (iii) Gold (iv) Iron

• A. (i), (ii), (iii) and (iv)
• B. (i), (iii), (iv) and (ii)
• C. (i), (ii), (iv) and (iii)
• D. (i), (iv), (ii) and (iii)