Marissa is using rationalization as her defense mechanism. She justifies her behavior by framing it as a response to being bothered, rather than taking responsibility for breaking the toy. Based on the provided options, it seems that none of them explicitly list rationalization. However, if you have to choose from the given options, she might be illustrating some form of projection, as she is projecting her feelings of annoyance onto the situation rather than acknowledging her own responsibility.
If you must stick to the specific options provided, the closest choice would be:
O projection
However, please note that "rationalization" would be the most accurate label for her behavior.