What are the following ....
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 answer is:
C) to foreshadow tragedy
The writers usually writte about past actions and situations that the characters live are useful to give an idea of the way life treats our characters and how their fortune is set, in this way talking about past tragedies can foreshadow tragedy in the future.