I believe the answer would be the <em>third option, 70.</em>
Sarcasm can be used to hurt or offend or can be used for comic affect.Sarcasm is an ironic or satirical remark that seems to be praising someone or something but is really taunting or cutting.
Sarcasm Examples: I'm trying to imagine you with a personality.
-I work 40 hours a week to be this poor.
-Is it time for your medication or mine?
-Well, this day was a total waste of makeup.
-Whatever kind of look you were going for, you missed.
-Not the brightest crayon in the box now, are we?
-Nice perfume. Must you marinate in it?
-Earth is full. Go home.
-Suburbia: where they tear out the trees and then name streets after them.
-This isn't an office. It's Hell with fluorescent lighting.
-I majored in liberal arts. Will that be for here or to go?
-Don't bother me. I'm living happily ever after.
Sentence 3: "However, researchers ... ice cream." It's not really necessary to provide <em>all</em> of those examples, a few are nice, but the number in that sentence make it seem run on and hard to read.