Assume That We Have a Random Object Referenced by a Variable

Assume that we have a Random object referenced by a variable called generator. Which of the following lines will generate a random number in the range 5-20 and store it in the int variable randNum?

A) randNum = generator.nextInt(15) + 5;
B) randNum = generator.nextInt(15) + 6;
C) randNum = generator.nextInt(16) + 5;
D) randNum = generator.nextInt(16) + 6;
E) none of the above