What Is the Minimum Value Of $7 x ^ { 3 } - 6 x + 7 ?$

Multiple Choice

What is the minimum value of $7 x ^ { 3 } - 6 x + 7 ?$ Restrict your attention to the horizontal span of 0 to 6.

A) 1.8
B) 4.86
C) 0.53
D) 8.16