Suppose $a < b$. The maximum value of the integral $$\int _ { a } ^ { b } \left( \frac { 3 } { 4 } - x - x ^ { 2 } \right) d x$$ over all possible values of $a$ and $b$ is (a) $3 / 4$. (B) $4 / 3$. (C) $3 / 2$. (D) $2 / 3$.
Suppose $a < b$. The maximum value of the integral
$$\int _ { a } ^ { b } \left( \frac { 3 } { 4 } - x - x ^ { 2 } \right) d x$$
over all possible values of $a$ and $b$ is\\
(a) $3 / 4$.\\
(B) $4 / 3$.\\
(C) $3 / 2$.\\
(D) $2 / 3$.