Comparing marginal revenue to marginal cost
(i) reveals the contribution of the last unit of production to total profit.
(ii) is in making profit-maximizing production decisions.
(iii) tells a firm whether its fixed costs are too high.

(i) reveals the contribution of the last unit of production to total profit

and

(ii) is helpful in making profit-maximizing production decisions.

Explanation:

As MR and MC can tell u what the last output contributed to the profit. change in profit = MR-MC. So we can gain insight on the profit and firm can then according to this make decision on how much to produce i.e. level where MR = MC.

answer; /// i believe that the correct answer is ( contemporary crm)

a. money supply  

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