Answer:
an unsolved mystery
a story based on historical events
a love story
an action-packed story
a story about the future
Explanation:
I would check all of these, this is a matter of personal preference.
Love is the answer you are looking for. Orsino is in love with Olivia. Olivia is in love with Cesario. Viola is in love with Orsino. Therefore your answer is Love.
C, i think is the answer.