Final answer:
The Indus River flows through Pakistan and the Ganges River flows through India, making the correct answer B: Indus; Ganges.
Step-by-step explanation:
The Indus River flows through Pakistan, while the Ganges River flows through India. Therefore, the correct answer is choice B: Indus; Ganges. The Indus River originates from the northern part of the Karakoram mountains, traverses through the fertile plains of Pakistan, and is essential for the region's agriculture and textile industry. The Ganges, on the other hand, is a significant river flowing through northern India, providing fresh water to a large population and holding religious significance before it reaches Bangladesh and eventually empties into the Bay of Bengal.