Explanation: The Crusades can be viewed as a form of pilgrimage, in which devout worshippers travel to a place of religious significance as a form of worship. This idea best matches (A). Eliminate (B) because the Crusades were not waged against a heretical interpretation so much as a different religion entirely. Eliminate (C) because although the Crusades invigorated trade in the Mediterranean, the speech itself doesn’t mention this. Eliminate (D) because there is no mention of art in the passage.