The food source that provides the most selenium per serving among the options listed is Tuna, 3 oz. Tuna is known to be rich in selenium, typically containing a higher amount compared to the other options provided.
Here's a quick reference for selenium content in these foods:
- Sunflower seeds, 1/4 cup: Moderate in selenium.
- Egg noodles, cooked, 1 cup: Very low in selenium.
- Egg, fried, 1 large: Contains some selenium, but less than tuna.
- Tuna, 3 oz: High in selenium.
Thus, tuna is the best choice for selenium content.