The correct answer is Makar Sankranti.

Makar Sankranti is a harvest festival celebrated across India and marks the transition of the Sun into Makara (Capricorn), signifying the beginning of the northward journey of the Sun and the arrival of spring in the northern hemisphere. While other festivals mentioned are significant in India, they are not primarily associated with welcoming the spring season. Raja Parba is an agrarian festival, Holi is a festival of colors celebrating the arrival of spring in some parts of India, but Makar Sankranti has a broader pan-Indian reach and stronger association with the solar transition and the start of spring. Deepawali is a festival of lights celebrated in autumn or fall. Therefore, Makar Sankranti uniquely aligns with the question's focus on a spring festival.

The festival's timing varies slightly depending on the solar calendar but generally falls in January, coinciding with the astronomical transition and the cultural significance of welcoming spring.