Solve the Problem A) 6
B) -3
C) -2
D) -6

Solve the problem.
- $$\text { Suppose that } f \text { is continuous and that } \int _ { - 3 } ^ { 3 } f ( z ) d z = 0 \text { and } \int _ { - 3 } ^ { 7 } f ( z ) d z = 2 \text {. Find } - \int _ { 3 } ^ { 7 } 3 f ( x ) d x \text {. }$$

A) 6
B) -3
C) -2
D) -6