Which country expanded its empire the most during the age of discovery? a. africa b. germany c. west indies d. spain

Spain.
The Spanish Empire (Spanish: Imperio español) was one of the largest empires in history. It reached the peak of its military, political and economic power under the Spanish Habsburgs,[1] through most of the 16th and 17th centuries, and its greatest territorial extent under the House of Bourbon in the 18th century, when it was the largest empire in the world. The Spanish Empire became the foremost global power of its time and was the first to be called the empire on which the sun never sets.

The answer is beneficial.