The Dominican philosopher who harmonized rational thought with Christian beliefs was Thomas Aquinas, making option (c) the correct choice.
The Dominican philosopher who advocated for the compatibility of rational thought with Christian beliefs was Thomas Aquinas. He played a pivotal role in medieval philosophy, particularly in reconciling Aristotelian philosophy with Christian theology. Aquinas emphasized the use of reason to explore and understand theological truths, asserting that faith and reason could coexist harmoniously.
His influential work, such as "Summa Theologica," contributed significantly to scholasticism, shaping the intellectual landscape of the Middle Ages. The options presented—William the Conqueror, Eleanor of Aquitaine, and the Concordat of Worms—are unrelated to Thomas Aquinas's philosophical contributions and Christian synthesis. Therefore, the correct answer is (c) Thomas Aquinas.