Evaluate the Sum $$\sum _ { k = 1 } ^ { 4 } ( - 1 ) ^ { k } \cdot - 2 k$$

Multiple Choice

Evaluate the sum. Round to two decimal places, if necessary.
- $$\sum _ { k = 1 } ^ { 4 } ( - 1 ) ^ { k } \cdot - 2 k$$

A) 20
B) $- 4$
C) $- 20$
D) 16