Which expression best conveys the advice given about trivial matters?

The answer effectively captures the essence of the advice regarding trivial matters by emphasizing the impact these matters can have on an individual. By stating that one "shouldn't let trivial matters affect you," it conveys the notion of maintaining emotional detachment and prioritizing one's responses to life's challenges. This expression suggests a proactive approach to managing one's focus and emotional wellbeing, ultimately advising not to allow insignificant issues to disrupt one's peace of mind or daily life.

The other options, while related, do not convey the same nuanced advice. Ignoring trivial matters implies complete neglect, which may not adequately express the importance of maintaining emotional resilience. Focusing solely on significant matters, although it sounds sensible, does not address the impact that trivial matters can have when allowed to take root in one's mind. Similarly, stating one shouldn't focus on trivial issues is somewhat vague and doesn't suggest the degree of emotional impact that is cautioned against. Hence, the selected answer captures a more comprehensive perspective on managing trivialities in life.