Let $\int _ { 1 } ^ { 3 } f ( x ) d x = 14$

Multiple Choice

Let $\int _ { 1 } ^ { 3 } f ( x ) d x = 14$ and $\int _ { 8 } ^ { 3 } f ( x ) d x = - 5$ Then $\int _ { 1 } ^ { 8 } f ( x ) d x$ is

A) $- 19$
B) $- 9$
C) 9
D) 14
E) 19