"C. By reviewing information in and around the unknown word."
When attempting to decipher the meaning of a new word, it is often useful to look at what comes before and after that word. The surrounding words can give readers helpful context clues about the meaning and structure of the new word, as well as how it is used.
All this worksheet wants you to do is come up with the possesive noun using the given information.
Here is an example...
the painting created by Pablo Picasso ⇒ Pablo Picasso's painting