What should you look for when comparing and contrasting two things?

Which of the following lists of ordered pairs is a function?

Need to answer this question on a discussion board post

A. what should the time signature be for the b. every note in this example is (write the letter name.) c. circle all eighth notes. d. how many beats does the rest in the first measure get? e. give the example a final barline. bonus: include a dynamic marking of your choice.