Geography

The Khunjerab Pass is the highest paved international border crossing in the world and connects Gilgit-Baltistan in Pakistan with China. It is the main pass linking these two regions, making option A correct.

Balochistan is an arid region with very few perennial rivers. Authoritative sources including the official Government of Balochistan website and geographic studies list about 11 major rivers in the province, but many of these are seasonal or ephemeral streams rather than perennial rivers. Commonly, the number of main rivers recognized in Balochistan is around 4 to 5 perennial rivers. The question's option A (4 rivers) aligns best with the typical understanding of main rivers in Balochistan, as the other options overestimate the number of perennial rivers. The rivers include Zhob, Nari, Bolan, and Hingol among the main perennial ones, while others like Pishin, Lora, Mula, Hub, Porali, Rakshan, and Dasht are often seasonal or smaller streams. Therefore, option A is the most accurate choice.

Asia is the largest continent by area, covering approximately 44.58 million square kilometers, which matches option A.

K2, the second highest mountain in the world, is located in the Karakoram mountain range, which spans the borders of Pakistan, India, and China. It is not part of the Himalayas or the Pamir ranges.

The Thar Desert is often referred to as the 'Friendly Desert' due to the hospitable nature of the people living there and its relatively accessible environment compared to other deserts like the Sahara or Thal.

The Sahara Desert spans across multiple countries in North Africa, including Egypt, Niger, Libya, Mauritania, Algeria, and Mali. Therefore, all the countries listed in options A, B, and C are covered by the Sahara Desert, making option D correct.

Pakistan Standard Time (PKT) is UTC+5, which means it is 5 hours ahead of Greenwich Mean Time (GMT). Therefore, GMT is 5 hours behind Pakistan Standard Time, making option C correct.

The Wakhan Corridor is a narrow strip of Afghanistan that separates Pakistan from China, not Tajikistan. It extends to the east of Afghanistan, creating a buffer between Pakistan and China.

Pakistan Steel Mills is located in Karachi, so the correct answer should be Karachi. However, option B is Karachi, so the correct answer is B, not D. The original correct_answer 'B' is correct. The explanation was missing and has been added.

The Khyber Pass is the most famous mountain pass connecting Pakistan and Afghanistan, historically serving as a key trade route and strategic military location. The other passes listed do not directly connect the two countries as prominently as the Khyber Pass.