Answer:
cause the production of wheat to increase at every point on a production possibilities curve but not affect the production of steel, that is the curve moves outward on the wheat axis only.
Explanation:
The fertilizer is an input for the wheat industry, therefore it will not have an impact on the efficienty of the resources used in the steel industry.
With the new input which is more efficient the economy will be able to produce a higher yield of weath but, will not change the steel production possibilities. This will make the FPP move outwards in the weath axis only .