Question 1: which. Question 2: that.
The answer is b, are.
The reason is because it is the only one that fits in the sentence that makes sense!
A predicate nominative is the first noun following a linking verb, such as to be (or could be in this sentence). Having this in mind, the predicate nominative is the word planet.
Answer:
Hi! Give me feedback!
Explanation:
I dont think the world could become a perfect place because nobody is perfect!:)