(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
Silver from Peru and Mexico did enhance Europe's wealth, and Europe used this silver specifically to finance its trade with Asia — (R) directly explains (A).
Source: Chapter 3 (The Making of a Global World), Section 1.3 — Conquest, Disease and Trade
The textbook passage explicitly states: "Precious metals, particularly silver, from mines located in present-day Peru and Mexico also enhanced Europe's wealth and financed its trade with Asia." This single sentence confirms both (A) and (R), and shows a direct causal link — making (R) the correct explanation of (A). Option (A) is therefore the right choice.