Which sentence is punctuated correctly?
a.
we grated one-third of that hunk of cheddar cheese.
b.
amy has collected forty three cans of food for the holiday food drive.
c.
three quarters of the people who live in this house are female.
d.
the baseball park is one half mile down the road.

The sentence that is punctuated correctly is option A. We grated one-third of that chunk of cheddar cheese. This sentence is correctly punctuated because of the compound word "one-third". It is a general rule that all spelled out numbers are considered as compound words, that's why they should be connected with a hyphen.