Answer:
C. Disillusionment
Step-by-step explanation:
Disillusionment can be described as a loss of touch with reality as a result of disappointments after finding out things weren't as we thought them to be.
The writer laments that after her breakup with Marcus, she hasn't bothered dating anymore because she doesn't feel the need to meet someone new, fall in love again and get hurt. She's disappointed and hurt from her past relationship which has caused her to lose hope on love and the thoughts of it as she views it as a waste of time.