FIA

The Battle of the Trench (Ghazwat al-Khandaq) took place in the fifth year after Hijrah (5 AH), specifically in the month of Shawwal in 627 CE. This is well documented in Islamic history sources and confirmed by multiple reliable references. The battle involved the Muslims defending Medina by digging a trench on the advice of Salman al-Farsi, successfully repelling a confederate army. Therefore, the correct answer is 'B' (Fifth Hijrah).

LED stands for Light Emitting Diode, which is a semiconductor device that emits light when an electric current passes through it. This is the widely accepted and correct expansion of the acronym LED.

CSS stands for Cascading Style Sheets, which is the correct and widely accepted full form used in web development for styling web pages.

In the Quran, 'Tasmia' refers to the phrase 'Bismillah' (In the name of Allah), which is recited at the beginning of most chapters. It signifies invoking God's name before starting an action.

HEC stands for Higher Education Commission, which is the official body responsible for higher education in Pakistan. The other options are incorrect expansions of the acronym.

CU stands for Control Unit, which is a key component of a computer's CPU responsible for directing operations within the processor.

WASA stands for Water and Sanitation Agency, which is the official name of the organization responsible for water supply and sanitation services in various cities in Pakistan.

Cache memory is a small, fast memory located inside or very close to the CPU to speed up access to frequently used data and instructions, improving overall processing speed.

K2 is the second highest mountain in the world and 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 captain of the Pakistan cricket team during the 2015 World Cup was Misbah-ul-Haq. He led the team throughout the tournament, including the quarter-final match. Shahid Afridi was a key player but not the captain during the World Cup. Shoaib Malik was also part of the team but did not captain the side. Therefore, the correct answer is Misbah-ul-Haq (option C).