D. Although - This option best fits the sentence's meaning, indicating a contrast between the unhealthy snack choices and the recommended healthier options.

C. the tastier - This option completes the comparative sentence, suggesting that the more natural the food is, the tastier it is.

B. every - This option is the correct preposition to indicate the frequency of drinking water.

C. some - This option indicates an indefinite quantity of energy, fitting the context of a breakfast meal.

A. goes - This option completes the sentence grammatically and makes sense in the context of controlling the ingredients in a home-cooked meal.