“well, in that hit you miss: she'll not be hit, with cupid's arrow; she hath dian's wit” is an example of

“Well, in that hit you miss: she'll not be hit, With Cupid's arrow; she hath Dian's wit” is an example of an allusion.

An allusion is an expression designed to call something to mind without mentioning it explicitly. In this scene Romeo is complaining that Rosaline does not love him. Romeo said that she is too smart to fall in love with him. He compares her to Dian who was a sworn virgin.

"the day we found the sharks' teeth" i would say highlight the element of the plot as it sets its boundaries and centers the adventures of them being on a boat and cleaning spit of sand.

the correct answer is:

this is an example of the writer telling through description rather than showing through dialogue.

sometimes writers like to explain explicitely what's happening instead of adding dialogues of the situations., which is the case in this passage,