I think its b if I'm not mistaken
Tybalt is Juliet's cousin, originally, Tybalt wanted to duel Romeo instead. But since he and Juliet are married, he cannot fight Tybalt as he is basically his cousin-in-law, thus, Romeo rejects Tybalt's challenge. Mercutio finds this quite cowardly as a result he himself challenges Tybalt to fight.
I visited my aunt’s cabin last weekend. It’s the same cabin that Billy the Kid once spent a winter, and it doesn’t look or feel like much has changed there since then