More details so i can answer please
Calpurnia's cot shows how segregation is everywhere in Maycomb, including the Finch home.
We know that Aunt Alexandra has somewhere to sleep when she stays with them, suggesting that they have a spare bedroom. However, when Calpurnia stays with the Finches, she is not allowed to stay in the spare room.
The first one is correct. "It is like" the best decision you can ever make.
Saying it that way, is the same as saying that it would be the best decision that you can ever make, but adding more to it. Almost as if soeaking to someone who is overdramatic, and constantly say the word like.
I hope this helps
The award for excellence in architectural design will go to the architect _whom_ the committee selects
Antecedent _architect_.
From the dictionary:
Antecedent: a word or phrase that a pronoun refers back to:
In the sentence "He picked a book off the shelf and handed it to Sally", "book" is the antecedent of "it