At the end of the long wars with portugal in angola and mozambique, many portuguese settlers joined forces with the new government fled and took their wealth with them stayed to train new administrators waged war against the new government

After the independence war in Mozambique and Angola, most Portuguese settlers fled and took their wealth with them.

NATO.

Explanation:

After the post-world war II, the Portuguese army force viewed themselves as confronted with the paradox caused by the dictatorial regimes of the Estado Nova, since 1926 an placed the forces put of the east-west conflict.  And this regime was responsible for keeping the Portugal vast overseas territories under a strict control and thus protecting the citizens.  After which the Portuguese joined NATO. As a founding member of 1949,  and integrated with the various military commands of the NATO.

The correct answer is a)  a resource with a limited supply; it will run out.