Assume that aList is a valid ArrayList containing the following:

5.3, 15.1, 8.2, 6.3, 24.1, 2.0, 4.1

Which of the following places 100 immediately before 15.1 in aList?

a	aList.add(2, 100);
b	aList.add(100);
c	aList.add(1, 100);
d	aList.add(15.1, 100);
e	aList.add(100, 1);