The accurate pairings of stages with their applications are as follows:
1. One thread stage aligns with Chikki, an Indian confection prepared from sugar and nuts.
2. Soft ball stage corresponds to Gujiyas, a fried pastry filled with sweetened khoya or coconut.
3. Firm ball stage is matched with Sohan papdi, an Indian sweet crafted from flour, sugar, and ghee.
4. Hard ball stage is associated with Gajak, a brittle sweet treat made from sesame seeds and jaggery.
Therefore, the correct correspondence is (C).