The response that best explains how the Hajj impacted Mansa Musa’s reputation is:
People throughout the Middle East and Europe heard of Musa’s immense wealth and power.
Mansa Musa's pilgrimage (Hajj) to Mecca in the 14th century was notable not only for its religious significance but also for the lavishness of his caravan and the wealth he displayed, which left a lasting impression on those who heard about it. This contributed significantly to his reputation.