What does Aunt Alexandra most likely mean when she says, "This is the last straw, Atticus"?

i believe it is "“i’ll beat thee, but i would infect my hands.”

explanation:

the correct answer is b:

romeo and company are going to sneak in through the back.  

romeo was depressed because he wanted to try to forget about rosaline and be happy again. so mercutio told him to just go and have fun. and they sneak through the back because capuleto and montague families were enemies.

the answer is a and b on e2020