If $f ( x ) = x ^ { 2 } - x + 4$

Multiple Choice

If $f ( x ) = x ^ { 2 } - x + 4$ , evaluate the difference quotient $\frac { f ( a + h ) - f ( a ) } { h }$ .

A) $2 a - 4$
B) $2 a + h - 4$
C) h
D) $2 a - h - 4$
E) None of these