The correct answer is option 'C': He was absent in school for the first time.

Eating jalebis had a negative impact on the person's health, leading to their absence from school. Here's an explanation of why this happened:

1. **Introduction to jalebis**: Jalebis are a popular sweet dish in India and other South Asian countries. They are made by deep-frying a wheat flour batter in pretzel or spiral shapes and then soaking them in sugar syrup.

2. **Possible health issues**: Jalebis contain a high amount of sugar and are deep-fried, which makes them high in calories and fat. Consuming excessive amounts of jalebis can lead to various health problems, especially if consumed regularly or in large quantities.

3. **Negative effects on health**: Eating jalebis can cause several negative effects on the body, including:

a) **Weight gain**: Due to their high calorie and fat content, consuming jalebis regularly can contribute to weight gain and obesity.

b) **Digestive issues**: The high sugar content in jalebis can disrupt the digestive system and lead to issues like indigestion, bloating, and constipation.

c) **Energy crash**: Jalebis are high in simple sugars, which can cause a spike in blood sugar levels followed by a rapid drop. This can result in a sudden energy crash, leaving the person feeling tired and lethargic.

4. **Impact on school attendance**: In this context, eating jalebis had a significant impact on the person's health, causing them to be absent from school for the first time. The negative health effects mentioned above, such as digestive issues and fatigue, likely made the person feel unwell and unable to attend school.

5. **Importance of regular attendance**: Regular attendance is crucial for academic progress and staying up-to-date with lessons. However, in this case, the person's health was compromised due to consuming jalebis, leading to their absence from school.

In conclusion, eating jalebis had a negative impact on the person's health, resulting in their absence from school for the first time. It is essential to maintain a balanced and healthy diet to avoid such health issues and ensure regular attendance in school.