propose引导的从句谓语动词是be？为什么不用is呢？be可以做谓语动词吗？

原句：The commission proposed that funding for the park's development, which could be open to the public early next year, is obtained through a local bond issue.

A) that funding for the park's development for the park's development, which could be open to the public early next year, is

B)that funding for development of the park, which could be open to the public early next year, be

正确答案是B

i 'm confused??