Finish the phrase: When in doubt,.....

The phrase "When in doubt, throw it out" emphasizes the importance of safety, particularly when it comes to food handling and consumption. This principle is focused on the idea that if there is any uncertainty about the freshness, quality, or safety of a food product, it is better to discard it rather than risk foodborne illness or other health issues. This approach aligns with food safety guidelines, which stress the importance of erring on the side of caution to protect one's health.

The other options suggest different actions when faced with uncertainty. Asking a professional or seeking advice from friends could be helpful in some situations, and taking a taste could seem like a tempting solution; however, these approaches might not adequately address potential health risks. In certain cases, tasting a questionable food product could lead to serious health hazards, particularly if there is a risk of contamination. Thus, prioritizing safety by discarding dubious food items is the most responsible choice.