Traversing ArrayLists

AP Computer Science A· difficulty 4/5

ArrayList<Integer> list = new ArrayList<>();
list.add(1);
list.add(2);
list.add(3);
int total = 0;
for (int x : list) {
    total += x;
    if (x == 2) list.add(99);
}
System.out.println(total);

What output is most likely?

A
$6$
B
$99$
C
$ConcurrentModificationException$
check_circle
D
$105$

Explanation

Modifying an ArrayList during a for-each loop throws ConcurrentModificationException at runtime.

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