Geography

The most important area in the Indus Valley civilization was the river system, particularly the Indus River, which provided water for agriculture, transportation, and supported the development of settlements. Thus, 'rivers' is the most accurate answer.

Washington D.C. is located on the Potomac River, which flows through the eastern United States and is a well-known geographical fact.

Borith Lake is located in Gilgit-Baltistan (GB), Pakistan. It is a well-known alpine lake in this region, making option B the correct answer.

Saudi Arabia is the largest country in the Arabian Peninsula by area, significantly larger than Yemen and Iraq, which is not part of the Arabian Peninsula. Therefore, option A is correct.

Sinkiang Province, also known as Xinjiang, is an autonomous region in China. Therefore, it belongs to China.

The Siberian region is located in Russia, which is primarily part of the Asian continent. Therefore, the correct answer is Asia.

The Indus River originates in the Tibetan Plateau, specifically near Lake Mansarovar in Tibet. Therefore, the correct answer is Tibet.

Myanmar is the country located to the east of India and has experienced civil unrest in recent years, making it the correct answer. Bhutan is to the northeast but is generally stable, Turkey is not east of India, and 'None of these' is incorrect.

The Arabian Peninsula is the largest peninsula in the world, covering about 3.2 million square kilometers. The other options are either not peninsulas or are smaller in size.

A group or chain of islands is called an 'Archipelago.' The other options do not relate to islands: Areopagus is a historical council in Athens, Archaeopteryx is a prehistoric bird, and Archipenko is a sculptor's name.