In 2014, Russia Challenged the United States and Its European

In 2014, Russia challenged the United States and its European allies by

A) supporting attempts to overthrow the government of Libya.
B) refusing to sell oil to any democratically governed country.
C) seizing control of the Crimean Peninsula and amassing troops along other portions of the Ukrainian border.
D) supplying nuclear warheads and intercontinental ballistic missiles to North Korea.