**Core Concept**
Mid-day meal schemes are public health interventions aimed at improving the nutritional status of school-going children, particularly in developing countries. These programs provide free or subsidized meals to students, aiming to address hunger and malnutrition.

**Why the Correct Answer is Right**
Mid-day meals have been shown to have a positive impact on children's physical and cognitive development, particularly in regions where access to nutritious food is limited. The provision of mid-day meals can lead to improved attendance, reduced dropout rates, and enhanced learning outcomes. Additionally, mid-day meals can help alleviate hunger and malnutrition, which are significant public health concerns in many developing countries.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because while mid-day meals may have some economic benefits, such as reducing poverty and hunger, these are not their primary objectives.
**Option B:** This option is incorrect because mid-day meals are not primarily focused on promoting agricultural production or food security, although they may have some indirect benefits in these areas.
**Option C:** This option is incorrect because mid-day meals are not primarily focused on promoting maternal and child health, although they may have some indirect benefits in this area.

**Clinical Pearl / High-Yield Fact**
A key benefit of mid-day meal schemes is that they can help reduce the prevalence of stunting and wasting in children, which are significant public health concerns in many developing countries.

**Correct Answer: B. Improved learning outcomes and reduced dropout rates.**