FIA

Pakistan won the Hockey World Cup in 1971. The other years listed (1978 and 1982) are incorrect for Pakistan's victories, and "All of these" is therefore not correct.

Balochistan is the largest province of Pakistan by area, covering approximately 44% of the country's total land area, making option B the correct answer.

Nazir Sabir was the first Pakistani to successfully climb K-2 in 1977. Ashraf Aman, although a notable mountaineer, was not the first Pakistani to summit K-2. Therefore, option A is correct.

Pakistan's largest export sector is textiles, which includes garments, cotton yarn, and fabrics. This sector contributes the most to the country's export earnings compared to oil, gold, or other categories.

The word 'exonerate' means to free someone from blame or fault. Its antonym is 'charge,' which means to accuse or hold responsible for a fault or crime. Therefore, 'Charge' is the correct opposite of 'Exonerate.'

The 1965 war monuments commemorate the Indo-Pakistani War of 1965, which was primarily fought over the disputed region of Jammu and Kashmir. Therefore, monuments related to this war are built over the State of Jammu and Kashmir.

The Holy Prophet Muhammad (SAW) had two sons, Qasim and Abdullah, both of whom died in infancy. Therefore, the correct answer is 2.

Fluorine is the most electronegative element in the periodic table due to its high effective nuclear charge and small atomic radius, which strongly attracts electrons in a chemical bond.

The Charter of Madina, also known as the Constitution of Madina, contained 47 articles or clauses, with some sources mentioning 53 clauses depending on the interpretation and inclusion of sub-clauses. Option A reflects this range accurately.

The Thal Desert in Pakistan stretches approximately 290 miles (470 kilometers) in length. Therefore, option C is the most accurate choice among the given options.