What is copiedNums' length after the code segment?

int[] originalNums = {1,2,3,4,5}; int[] copiedNums; copy(originalNums, 3); ... public static int[] copy(int[] nums, int changeAmt) { int[] modifiedNums = new int[nums.length * changeAmt]; int index; for(index = 0; index < nums.length; ++index){ modifiedNums[index] = nums[index]; } return modifiedNums; }

a)null

b)5

c)15

d)0