can you give the story link so i could answer the question?
Tybalt wrote the letter that
Benvolio and Mercutio
discuss in Act II, scene iv.
I cannot see which is italicized so I will say which one is cause and which one is effect: The effect is that the cookies in the oven became charcoal. The cause of why the cookies became charcoal is that 'David left the cookies in the oven too long.'