请问这个句子中的most如何理解,它是修饰什么的,是fascinates还是about?

One of the things that fascinates us most about cats in the popular belief that they have nine lives.

One of the things that fascinates us most about cats in the popular belief that they have nine lives.

1. most 是程度副词 much 的最高级,修饰 fascinates。(最让大家着迷)

2. 介词短语 about cats 作定语,修饰主语One of the things。去掉定语从句便知:

One of the things (that fascinates us most) about cats ...