Someone who is behaving in a malicious way might,

A. offer to bake you a cake for your birthday.
B. carefully research a subject that interests her.
C. spread untrue information about another person.*
D. cry easily at sad scenes in movies.

Correct.

To determine the correct answer, we need to identify the behavior that aligns with malicious intent. Let's break down the options:

A. Offering to bake you a cake for your birthday does not exhibit a malicious behavior. It is a kind gesture, suggesting goodwill rather than malicious intent.

B. Carefully researching a subject of interest demonstrates a positive behavior of acquiring knowledge and understanding. It does not indicate any malicious intentions.

C. Spreading untrue information about another person is an act that can harm their reputation and well-being. This behavior aligns with malicious intent, as it involves intentionally causing harm to someone's reputation.

D. Crying easily at sad scenes in movies is unrelated to malicious behavior. It is a personal emotional response to cinematic content and does not involve causing harm to others.

Given the options, the correct answer is C, "spread untrue information about another person," as it aligns with malicious behavior.