Which of the following pairs is not matched between the Kumbh Mela festival…

The Kumbh Mela is a major Hindu pilgrimage that rotates among four sacred sites: Prayagraj, Haridwar, Nashik, and Ujjain. The cycle for the full Kumbh Mela at each location is every 12 years, not every second year. Therefore, Option B is the unmatched pair because it incorrectly claims the Kumbh Mela occurs every second year. The Maha Kumbh, held at Prayagraj, takes place once every 144 years (after 12 Maha Kumbh cycles), making Option D correct. The Ardha Kumbh (Half Kumbh) occurs every six years at Haridwar and Prayagraj, validating Option A. The term 'Aquarius' refers to the astrological sign (Kumbha) associated with the festival, which aligns with the 12-year cycle mentioned in Option C. Since the question asks for the mismatched pair, Option B is the correct choice as it misrepresents the actual frequency of the Kumbh Mela.