Introduction:
The Pavana River is a significant river that flows through the city of Pune, Maharashtra, making option D the correct answer.

Details:
The Pavana River is a tributary of the Bhima River and is located in the western part of Maharashtra. It originates in the Western Ghats near Lonavala and flows through the city of Pune before eventually joining the Bhima River.

Significance:
The Pavana River holds great importance for the city of Pune and its surrounding areas. It provides a source of water for irrigation purposes, as well as for domestic and industrial use. The river also plays a vital role in maintaining ecological balance and biodiversity in the region.

Hydroelectric Projects:
The Pavana River has been utilized for hydroelectric power generation. Several small and medium hydroelectric projects have been constructed along its course to harness its water potential. These projects not only contribute to the electricity generation but also aid in water management and flood control.

Recreational Activities:
The Pavana River also offers recreational opportunities for the residents of Pune. The riverbanks are often frequented by locals and tourists for picnics, boating, and other water sports. The serene and picturesque surroundings of the Pavana River make it an ideal spot for leisure activities and relaxation.

Environmental Concerns:
However, the Pavana River faces several environmental challenges, including pollution and encroachments along its banks. Industrial and domestic waste discharge, as well as the dumping of solid waste, have led to the deterioration of water quality. Efforts are being made by the authorities and environmental organizations to address these concerns and restore the river's health.

Conclusion:
In conclusion, the Pavana River flows through the city of Pune, Maharashtra, making option D the correct answer. This river holds significant importance for the region, serving as a source of water, hydroelectric power generation, and recreational activities. However, it also faces environmental challenges that need to be addressed for its conservation and sustainable use.