The correct answer is B: City of Gold.
In 17th-century Europe, legends spread about El Dorado — the fabled city of gold in South America, and many expeditions set off in search of it.
The passage directly states: "Legends spread in seventeenth-century Europe about South America's fabled wealth. Many expeditions set off in search of El Dorado, the fabled city of gold." Examiners expect you to identify the key phrase "city of gold" linked to El Dorado.
Source: Chapter 3, Section 1.3 — Conquest, Disease and Trade.