题目选项分析

Many stock traders in the United States have set out to become global investors, convinced that limiting their investments to the U.S. stock market, which, though certainly home to the stocks of some of the world's great corporations, restricted their gains.

Many stock traders in the United States have set out to become global investors, convinced that limiting their investments to the U.S. stock market, even though it is certainly home to the stocks of some of the world's great corporations, restricted their gains.