Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
- $3 \cos ^ { 2 } x + 2 \cos x = 1$

A) $49.8 ^ { \circ } , 130.2 ^ { \circ } , 229.8 ^ { \circ } , 310.2 ^ { \circ }$
B) $51.8 ^ { \circ } , 128.2 ^ { \circ }$
C) $70.5 ^ { \circ } , 180.0 ^ { \circ } , 289.5 ^ { \circ }$
D) $103.2 ^ { \circ } , 145.2 ^ { \circ } , 283.2 ^ { \circ } , 325.2 ^ { \circ }$