Who says the following and why?

therefore be patient, take no note of him:
it is my will; the which if thou respect,
show a fair presence and put off these frowns,
an ill-beseeming semblance for a feast.

mercutio is telling romeo to cheer up.
capulet is telling tybalt to calm down.
the nurse is telling juliet to ignore romeo.
romeo is telling benvolio to ignore tybalt.