题目:这部分解释了为什么美国人比法国人更加千方百计地减肥。( )
A. It explains in part why Americans struggle more with their weight than the French do.
B. It explains partly how Americans struggle more with their weight than the French do.
C. It explains in part why Americans struggle more with their weight than the French.
D. It explains in part why Americans struggle less with their weight than the French do.
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