What is the sum of the arithmetic series below?
-105 +-100 + -95 + -90 +-85 + ... + -5 + 0 + 5+ ... + 85+ 90 +95 + 100 + 105
O A. O
O B. 1.050
O c. -1,050
OD: 2,152,5
O E. 2100