PLEASE HELP BEST ANSWER ILL GIVE BRAINLIEST!!
What is a formula for the nth term of the given sequence —> 50,-20,8

A) an = -125(-^2/5)^n-1
B) an = -125(-^2/5)^n
C) an = 50(-^5/2)^n
D) an = 50(^-2/5)^n