The spatial diffusion of portuguese exploration in the 15th and 16th centuries can be traced most accurately by examining -
a. the trade of slaves, precious metals, and spices.
c. the spread of wars within africa.
b. the spread of christianity throughout asia.
d. the spread of navigation technologies throughout europe.

The answer should be A.

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i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.