[求助]GWD-8-Q29

Because of a similarity to dance, synchronized swimming—exhibition swimming in which the movements of one or more swimmers synchronize to a musical accompaniment—is sometimes called water ballet, especially in theatrical situations.

1. of one or more swimmers synchronize to

2. of one swimmer or more is synchronized with

3. of one or more swimmers are synchronized with

4. by one swimmer or more is synchronized to

5. by one or more swimmers synchronize to

答案是C

为什么A不对呢？synchronize本身就是动词，为什么加Be动词？这个词就是要这么用吗？

习惯用法是be synchronized to 还是 be synchronized with？