The best answer explaining the relative significance of the trans-Saharan and Indian Ocean trade routes is:
C. The routes were equally significant—each in its own way—as they both contributed to significant cultural developments along the routes, and worth cannot be measured simply by the goods that were traded.
Both trade routes played critical roles in their respective regions by facilitating not only the exchange of valuable goods but also the spread of ideas, culture, and innovations. Each route had unique characteristics and impacts that cannot be easily compared in terms of value of the goods alone.