The correct answer is C. jealousy.
Jealousy is a feeling of insecurity or resentment aroused by a rival or someone believed to be more fortunate than oneself. It is often accompanied by feelings of anger, envy, and resentment. Jealousy can be a destructive emotion, but it can also be a motivating force. It can drive people to achieve great things, or it can lead to destructive behaviors.
Love is an intense feeling of deep affection. It is often accompanied by feelings of care, concern, and intimacy. Love can be a powerful emotion, and it can motivate people to do great things. However, love can also be a source of pain and suffering.
Hatred is an intense feeling of dislike or aversion. It is often accompanied by feelings of anger, disgust, and resentment. Hatred can be a destructive emotion, and it can lead to violence and other harmful behaviors.
Flattery is the act of praising someone in an excessive or insincere way. It is often used to gain favor or advantage. Flattery can be a harmless act, but it can also be used to manipulate or deceive others.
In the context of the question, the answer is jealousy because it is the only emotion that is consistent with the description of the feeling as “a feeling of insecurity or resentment aroused by a rival or someone believed to be more fortunate than oneself.” Love, hatred, and flattery do not fit this description.