Which is not a place in which gold accumulates?

a) hydrothermal vein deposits

b) oceans

c) placer deposits

d) rivers

B: Oceans

Gold accumulates in rivers, it is found in placer deposits and is also in hydrothermal veins

ocean is the correct answer.

Explanation:

There are many regions where gold accumulates, such as hydrothermal vein deposits,placer deposits, rivers but it does not accumulate in the ocean because the specific gravity of gold is higher than the gravels and sand that this reason gold is accumulated in the deep in the bedrock.

due to its weight, it settles down in the deep areas below the waterfalls, behind the big stones and within bends of a river.

Thus because of tremendous densities of gold is hydrothermal vein deposits,placer deposits, rivers accumulated in these regions.

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(nitrogen fixation) will be your answer sorry if im wrong