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Option A­

Size of wave
dependent on - velocity of wind and length of water surface
Impact on coast dependent on - size of wave and shape of sea bottom
Erosion dependent on - impact of waves and geo composition

So looking at this relation 
Only A fits the bill 
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It looks like the answer should be Option A : "The degree of erosion to which a coastline is subject is related to the shape of the sea bottom."
i . Since size of oceanic waves is a function of velocity & fetch (length of the surface of the water subject to those winds)
ii. The impact of waves against a coastline is a function of the size of the waves (i.e. dependent upon velocity & fetch) and the shape of the sea bottom.
iii. The degree of erosion to which a coastline is subject is a function of the average impact of waves (i.e. dependent upon velocity, fetch and the shape of the sea bottom) and the geologic composition of the coastline.
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Bunuel
­The size of oceanic waves is a function of the velocity of the wind and of fetch, the length of the surface of the water subject to those winds. The impact of waves against a coastline is a function of the size of the waves and the shape of the sea bottom. The degree of erosion to which a coastline is subject is a function of the average impact of waves and the geologic composition of the coastline.

If these statements are true, which one of the following must also be true?

(A) The degree of erosion to which a coastline is subject is related to the shape of the sea bottom.

(B) The size of oceanic waves will not fluctuate far from an average for any given stretch of ocean.

(C) The fetch of winds is related to the shape of the sea bottom.

(D) The size of oceanic waves is related to the shape of the sea bottom.

(E) The average velocity of the wind in an area plays no role in the degree of erosion to which a coastline is subject.
­
­


OFFICIAL EXPLANATION:



A. The degree of erosion to which a coastline is subject is related to the shape of the sea bottom.

Choice (A) makes sense because the impact of waves is related to the shape of the sea bottom, and the coast’s erosion is related to the impact of waves. Choice (B) is wrong because the statements only state the factors (wind velocity and fetch) that influence wave size; there’s nothing to suggest that wave size stays close to an average. Choice (C) doesn’t work; if fetch is the length of the surface of the water, it shouldn’t be related to the shape of the sea bottom. Choice (D) is wrong because the size of waves comes from wind and fetch, not the shape of the bottom. Choice (E) looks wrong, too. Wind velocity creates size of waves, size of waves affects impact, and impact affects erosion, so average velocity of wind playing no role in erosion doesn’t make sense. Choice (A) is the best answer.­
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