The first 5 terms of a sequence are shown below: 3, -2, -7, -12, -17

Which expression can be used to find the nth term?
A. a n = − 5 + 3 ( n − 1 )
B. a n = 8 − 5 n
C. a n = − 17 + 3 ( n − 1 )
D. a n = 3 + 5 n