Since you didn't post the options and I wasn't able to find them online, I will answer this question based on the information given.
Answer:
Chloe is a main character and a round character.
Step-by-step explanation:
Main characters are the most important characters in a literary work. They are the ones who advance the plot, which revolves around their conflicts. For that reason, main characters are described in great detail. They are the ones readers need to know the most, so that their actions and their results are important enough for readers to follow and care about. Main characters can be divided into protagonists and antagonists.
We can also say Chloe is a round character. A round character is made interesting by having several traits, many of them unique or important for the plot. They are more realistic and relatable. A round character is the opposite of a flat character, who has only a couple of traits and who is not deeply developed.