请问这道英语语法题There ought to be less anxiety over the perceived r

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请问这道英语语法题
There ought to be less anxiety over the perceived risk of getting cancer than ＿in the public today.A.exists B.exist C.existing D.existed
为什么选A项?

主要从意思上区分.
在当今社会,对于检察到患癌症的危险,比起实际存在的,本不应该有那么多的焦虑.
就是说,把句子分一下,就好做了.
弄清比较对像,因为than两边,结构对等.
over the perceived risk of getting cancer ,
对于检察到患癌症的危险,
There is much anxiety exists in the public today.
在当今社会,存在很多焦虑
but it ought to be less .
但,这种情况（There is much anxiety exists 这是个事实,用现在时,）本不应该有那么多.
省略相同成分,就只剩下exists.

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