Two terms in a geometric sequence are a5=15 and a6=1. What is the recursive rule that describes the sequence?

A) a1=225; an=an−1⋅5 an=an−1⋅5 , ,

B) a1=11,390,625; an=an−1⋅15 an=an−1⋅15 , ,

C) a1=50,625; an=an−1⋅15 an=an−1⋅15 , ,

D) a1=759,375; an=an−1⋅115

Please help!!