If the underlined word is <u><em>She</em></u>, then it is a <u><em>subject.</em></u>
If the underlined word is <em><u>board or water</u></em>, then it is an o<u><em>bject of the preposition</em></u>
I think it is b. Most beautiful, as c and d don't make sense. A is a possibility, but I'm pretty sure it is b. Most beautiful.
The simple subject is obviously kittens.....
B. The flaming bronze colors
Srry if I’m wrong