Answer :
A hard-boiled egg provides the least magnesium, option A is correct.
Animal-based foods, including eggs, tend to have lower magnesium content compared to plant-based sources. Spinach salad, being rich in leafy greens, provides a higher amount of magnesium. 15-bean soup likely contains a variety of legumes, which are generally good sources of magnesium. Espresso made with hard tap water might contribute some magnesium from the water itself.
Nonetheless, when comparing the options, a hard-boiled egg is expected to have the least magnesium content among them. It is essential to include a diverse range of magnesium-rich foods in the diet to meet the body's magnesium requirements, as it plays a vital role in various bodily functions, option A is correct.
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