Final answer:
The desire to control sources of gold and silver fueled competition among European countries for colonies in the Americas, as these precious metals were crucial for national wealth and prestige under the mercantilist system.
Step-by-step explanation:
The pivotal factor that propelled competition among European nations for colonies in the Americas was C) the desire to control sources of gold and silver. The Rise of Mercantilism and a pressing need to boost national wealth drove these explorations and subsequent colonization efforts. In pursuit of wealth and national prestige, European states were eager to find direct access to precious resources, thus avoiding the need to trade through intermediaries such as the Muslims who controlled the spice trade after the fall of Constantinople. Gold and silver became particularly enticing resources, symbolizing wealth and enhancing the country's international standing and monetary strength.
The success of Spain and Portugal in acquiring vast wealth from their colonies encouraged other European powers like the English, French, and Dutch to establish their own settlements in the New World. Colonies under the mercantilist system were seen as crucial sources of raw materials and, consequently, as vital components of a thriving empire. Over time, these colonial efforts led to intense imperial rivalries, as each country strove to outdo the other in amassing resources and wealth from the Americas.