I have a question on a homework problem. Select the function that represents an arithmetic sequence. 
A) A(n)=P+(n-1)i*p, where n is a posititve integer. 
B) A(n)=P(1+i)n-1, where n is any real number. 
C) A(n)=(n-1)(P*i)n, where n is any real number. 
D) A(n)=n+(P-1)i*P, where n is a positive integer.