A change in the supply of one factor of production a. can alter the earnings of all of the other factors. b. alters the earnings of that factor only. c. will not change the marginal productivities of other factors but may change their prices. d. alters the earnings of capital and labor but not land.

a. can alter the earnings of all of the other factors.

Explanation:

In the case when there is any change in the one factor of the supply so it would alter or made changes the earnings of all other factors not change the one factor or any other reason

It would fully impact the all the other factors earnings

Therefore as per the given options the first one is correct

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answer; tech (a) is correct;