Let a the first term of the sequence and q the ratio of the sequence. So, our exponencial function is in the form: [tex]f(n)=a\cdot q^{n-1}[/tex], where n is the number of the term of the sequence that we want find. So, as n is a natural number, a rasonable domain is the whole numbers. [tex]\to\text{The answer is C.}[/tex]
