The correct option "1 and 2 only" is validated by the geographical and cultural significance of the locations and their associated rivers. Pandharpur is known for the Chandrabhaga River, which is integral to the region's religious practices, particularly in the context of the Varkari sect. Similarly, Tiruchirappalli is situated on the banks of the Cauvery River, which plays a pivotal role in Tamil culture and agriculture. However, Hampi is primarily associated with the Tungabhadra River rather than the Malaprabha, which is a tributary of the Krishna, thus making the mismatch. The understanding of these geographical alignments is crucial for UPSC aspirants as it encompasses socio-cultural, historical, and environmental contexts, reinforcing the interconnections in India's vast heritage.