The correct answer is: A. Ghaggar river.
The Saraswati river is a mythical river in Hinduism. It is mentioned in the Rig Veda, one of the oldest scriptures of Hinduism. The Saraswati is said to have been a major river in ancient India, but it is now dry.
The Ghaggar river is a seasonal river in northern India. It is a tributary of the Indus river. The Ghaggar is said to be the modern-day remnant of the Saraswati river.
The Markanda river is a tributary of the Ghaggar river. It is a small river that flows through the states of Haryana and Punjab in India.
The Sutlej river is a major river in northern India. It is a tributary of the Indus river. The Sutlej is not related to the Saraswati river.
The Yamuna river is a major river in northern India. It is a tributary of the Ganges river. The Yamuna is not related to the Saraswati river.
The Saraswati river is said to have joined the Ghaggar river at the place called Pehowa. Pehowa is a town in the Kurukshetra district of Haryana, India. It is located on the banks of the Ghaggar river.