Find the Maximum or Minimum Value of the Function $f ( x ) = - 8.4 x ^ { 2 } - 1.9 x - 9.3$

Multiple Choice

Find the maximum or minimum value of the function. Approximate to two decimal places.
- $f ( x ) = - 8.4 x ^ { 2 } - 1.9 x - 9.3$

A) $2.03$
B) $- 9.19$
C) $- 9.62$
D) $- 0.11$