Question

Hurry please Which answer offers the best explanation of the idea of Manifest Destiny? A theory that the United States could only expand so much
A belief that the growth of the United States was a certainty
A belief that a country should share its resources with the world
A theory that land should rightfully belong to the strongest and bravest

Answer 1

A belief that the growth of the United States was a certainty.

Answer 2

Manifest Destiny was the belief that the expansion/growth of the US was right and bound to happen

The answer is: 
A belief that the growth of the United States was a certainty