Answer with explanation:
When you will look, at the points in the coordinate plane, (2,9), (3, 7.5), (4,6), (5,4.5), (6,3), (7,1.5), (8,0), they lie along a straight line, because
Slope between two points

So,all the points lie in a line.
y(0)=8
y(1.5)=7
y(3)=6
y(4.5)=5
y(6)=4
y(7.5)=3
y(9)=2
Now ,difference between two consecutive terms = 7-8=6-7=5-6=4-5=3-4=2-3=-1
So,→ Sequence is Arithmetic, because the terms have a common Difference.
Option A