In the 1840s, the term Manifest Destiny was used by many Americans to justify

The phrase “manifest destiny” suggested that expansion across the American continent was obvious, inevitable, and a divine right of the United States. Manifest destiny was used by Democrats in the 1840s to justify the war with Mexico.

the answer is:

c. economic output

the language of nature was a manifestation from god as he said "let there be light" and there was light the world began to assume visible, comprehensible form.

what ever we know now think of the old vision of creation we can be sure that with out the speaking of word -without language- we would have no science today with its striking power to illuminate the world.