The factors that contributed to the relative economic strength of China and Britain that best illustrate the continuities of the period 1450-1750 are related to the transfer of European navigation technology that significantly expanded global trade.
From the European technological development, such as the compass and the caravel, the first great navigations were facilitated, making possible the maritime exploration in search of expanding trade routes and conquering territories.
Therefore, The Great Navigations were the factor that boosted trade between nations that could increase their wealth and leverage the economy of their country.
So the correct answer is:
B. The transfer of European navigational technology expanded global trade significantly.
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