Final answer:
The subject of this question is Health. The answer is d) Unnecessary heroics, which refers to risking our lives needlessly for unnecessary reasons.
Step-by-step explanation:
The subject of this question is Health.
When we risk our lives needlessly, we put ourselves in danger without a valid reason. In the given options, the most appropriate answer would be d) Unnecessary heroics. This means putting ourselves at risk for unnecessary reasons, often driven by a desire for excitement or attention.
For example, engaging in dangerous stunts or actions without considering the potential consequences can be considered unnecessary heroics.