-2 to -4 = multiply by 2
-4 to -12 = multiply by 3
-12 to -48 = multiply by 4
-48 to -240 = multiply by 5
Our next three terms will require us to multiply by 6, then 7, then 8.
-240 x 6 = -1440
-1440 x 7 = -10080
-10080 x 8 = -80640
Answer: C
Hope this helps!