Step 1: IUCN stands for the International Union for Conservation of Nature and Natural Resources.
Step 2: It is a global organization working for conservation of biodiversity, sustainable use of natural resources, and environmental protection.
Step 3: As per standard biology and environmental science textbooks and examinations, the headquarters of IUCN is stated to be at Morges, Switzerland.
Step 4: Hence, among the given options, option (A) is correct.