When did Afghanistan ends monarchy and became a republic?

The correct answer is B. 1973.

Afghanistan was a monarchy from 1747 to 1973. In 1973, King Zahir Shah was overthrown in a coup d’état led by Mohammad Daoud Khan. Daoud Khan established the Republic of Afghanistan and became its first president.

Option A is incorrect because 1949 was the year that Afghanistan joined the United Nations.

Option C is incorrect because 1965 was the year that Afghanistan held its first parliamentary elections.

Option D is incorrect because 2000 was the year that the Taliban took control of Afghanistan.