6. Which of the following is the first 6 terms of an increasing arithmetic sequence?
A. -20,-18, -16, -14, -12,-10,
B. -18, -16, -13, -9, -4,-2,.
C. -16, -18, -20, -22,-24, -26,...
D. -14, -13,-11, -8, -3, 1, ...​