This is a tricky one! Choice D is very close to being correct, in my opinion — however, it slightly changes the intended meaning of the sentence.
Why? It's not the U.S. stock market itself which was restricting their gains. Rather, it was the traders' policy of limiting theirinvestments to the U.S. stock market only.
Consider these two sentences:
“Many amateur investors in the United States have set out to become cryptocurrency investors, convinced that limiting their investments
...
Why? It's not the U.S. stock market itself which was restricting their gains. Rather, it was the traders' policy of limiting theirinvestments to the U.S. stock market only.
Consider these two sentences:
“Many amateur investors in the United States have set out to become cryptocurrency investors, convinced that limiting their investments
...



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