The 3rd one is your correct answer. :3
They are the author's memories and impressions with the man he based Life of Pi off of. If you read the introduction(which is all in italics) he talks about how he came to write the book, and one thing the author mentions is the first meeting of real-life Piscine. So while the story is going on, the author adds in his thoughts on the main character.
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
1. Whatever goes on two legs is an enemy<span>. </span>
<span>2. Whatever goes on four legs, or has wings, is a friend. </span>
<span>3. No animal shall wear clothes. </span>
<span>4. No animal shall sleep in a bed. </span>
<span>5. No animal shall drink alcohol. </span>
<span>6. No animal shall kill any other animal. </span>
<span>7. All animals are equal. </span>
