i guess that get up is the answer
I'd say, since cats are known for being stealthy and sneaky, that Mercutio was calling Tybalt, well, stealthy and sneaky. I think the Prince of Cats thing is also an allusion because I remember reading about it somewhere but I can't remember much (eek! sorry...) <span>
But yeah, I think he was saying that Tybalt is sneaky and stealthy, but also skillful in many ways, and treacherous, to say the least.</span>
The answer is C) cause and effect because if it explores the relationship between and action and it's consequences you would be talking about a cause and then it's effect of what happened.