Answer:
Option A
Step-by-step explanation:
To find nth term we use the given options.
Lets pick any point from the graph and plug it in the given option
LEts pick (1,8) and (2,4)
, n=1, an=8
8=8 True
LEts check with (2,4), n=2 and an=4
4=4 True
Average rate of change from n=1 to n=3=
Average rate of change from n=1 to n=3 is -3