Explanation:

Navroz, also spelled Nowruz, is the traditional Iranian New Year, which is celebrated by various ethnolinguistic communities worldwide, particularly in Western Asia, Central Asia, the Caucasus, and the Balkans. It marks the spring equinox and the beginning of spring. For the Parsi community, who are Zoroastrians, Navroz holds significant cultural and religious importance as their New Year. Option A (Jains) celebrate Mahavir Jayanti and Diwali as important festivals, but not Navroz. Option B (Buddhists) celebrate various new year festivals depending on the region, such as Losar, but not Navroz. Option C (Sikhs) celebrate Vaisakhi as their New Year. Therefore, Navroz is specifically the New Year for Parsis (Zoroastrians).