Three students, Deion, Bashir, and Arianys, line up one behind the other. How many different ways can they stand in line?

There are 3 options for the first person in line, 2 options for the second person, and only 1 option for the last person. Therefore, there are 3 * 2 * 1 = <<3*2*1=6>>6 different ways they can stand in line. Answer: \boxed{6}.