Which of the following describes an attitude of cheerful disregard for rules?

The term "blithe" captures an attitude of cheerful disregard for rules and conventions. When someone is described as blithe, it indicates a carefree and lighthearted demeanor, often implying that they do not take serious matters to heart, including rules or societal expectations. This word suggests a sense of happiness that is so pronounced that it overshadows any concern for adhering to established guidelines.

In contrast, the other options lack this specific connotation. "Restrained" describes someone who is holding back emotions or actions, which is contrary to being cheerful and carefree. "Cautious" refers to someone who acts carefully to avoid potential problems or risks, showing concern for rules and consequences. "Excessive" implies an overabundance or going beyond necessary limits, which does not inherently convey cheerfulness or disregard for rules. Thus, "blithe" is the most fitting choice to describe someone who cheerfully disregards regulations.