Social darwinism is the theory that

a. only countries with colonies can compete in the world market

b. the american frontier stopped people from rebelling in the united states

c. life consists of competitive struggles in which only the strong survive

d. the united states should expand its territory from the atlantic and the pacific oceans

C is the correct option.

Explanation:

The theory was promoted by the 19th-century philosopher Herbert Spencer. This theory is the application of the theory of natural selection to social, political and economic issues. It follows the philosophy that the strongest survives in human issues.

The theory was used to promote the superiority of white Europeans. The worst implication of Social Darwinism was it's used for demonizing the jews and for justifying the Holocaust.

When Spencer started to promote this theory technology and the economy of "White Europeans" were advanced in comparison to other cultures and hence some argued that it was because of the social Darwinism.

step-by-step explanation:

100%     = 120

1%= 120/100=   1.2

9%   = 1.2 x 9=     10.8

10.80 to the 120 to get $130.80