Hi, I need help on this math question.

Match the sequence (term) with the correct type of sequence (definition).

1.128, 32, 8, 2, ... a.Arithmetic, common difference is 5

2.1, 3, 9, 27, ... b.Geometric, common ratio is 3

3.5, 10, 15, 20, ... c.Geometric, common ratio is 0.25

4.20, 17, 14, 11, ... d.Arithmetic, common difference is 3

I don't understand all of the information that they gave me but I think that the answer is :

1,B

2,D

3,A

4,C