Final answer:
A standard infant formula provides about 20 kilocalories (kcal) per ounce, which aligns with the necessary energy content for infant nutrition.
Step-by-step explanation:
The standard infant formula provides approximately 20 kilocalories (kcal) per ounce. This measurement is consistent with the food energy content generally provided in infant formulas for a healthy baby's growth and development. Food labels in the U.S. indicate the energy content in Calories, which are the same as kilocalories, to describe the energy a food contains. However, many other countries use either kJ or kcal for quantifying this food energy. Therefore, the correct answer to the question is C) 20 kcal.