The correct answer is option-1 Krishna. A Masonry dam is a type of dam constructed using stones or bricks held together by mortar. The largest Masonry dam has been constructed on the river Krishna. A masonry dam provides a strong and durable structure that can withstand the pressure of the water reservoir. It is built by placing individual blocks of stone or brick in layers, with mortar used to bond the blocks together. The Krishna River is one of the longest rivers in India and flows through the states of Maharashtra, Karnataka, and Andhra Pradesh. The construction of a masonry dam on the Krishna River highlights the engineering capabilities required to build a massive and robust structure to control and manage water resources.