Components of Food

Given below are the steps to test the presence of proteins in a
food item:
(i) Take a small quantity of the food item in a test tube, add
10 drops of water to it and shake it.
(ii) Make a paste or powder of food to be tested.
(iii) Add 10 drops of caustic soda solution to the test tube
and shake well.
(iv) Add 2 drops of copper sulphate solution to it.
Which of the following is the correct sequence of the steps?
(a) i, ii, iv, iii (b) ii, i, iv, iii
(c) ii, i, iii, iv (d) iv, ii, i, iii