__________ introduced Europeans to Muslim inventions, such as the astrolabe that helped sailors navigate the seas.

a. The Crusades (MY ANSWER)

b. The Reconquista

c. The Vikings

d. The Magna Carta

Yes, a.

The correct answer is a. The Crusades.

To arrive at this answer, we need to understand the historical context. The Crusades were a series of religious wars initiated by Western European Christians in the 11th, 12th, and 13th centuries. The primary goal of these expeditions was to recapture the Holy Land from Muslim control.

During these military campaigns, Europeans came into contact with Islamic cultures and their advanced knowledge and inventions. The astrolabe, a navigation instrument used to determine the positions of celestial objects, was one of the many innovations that European sailors learned from the Muslims.

Therefore, it was the Crusades that introduced Europeans to Muslim inventions, such as the astrolabe.