Because spain held such a dominant presence in the americas, portugal focused on
a. africa
b. india
c. china
d. europe

Because Spain held such a dominant presence in the America's, Portugal focused on Africa. The correct option among all the options given in the question is option "A". The Spanish empire back then was one of the largest empire among all the empires. They were the masters of exploring the world via sea route and so they had created colonies far before the other. In America the Spanish were already present and expanding when Portugal decided to look elsewhere for creating colonies.

Mg is used to measure mass