Traversing ArrayLists

AP Computer Science A· difficulty 4/5

for (Integer x : list) {
    if (x == 0) list.remove(x);
}

What problem occurs?

A
$for-each cannot iterate ArrayList$
B
$list.remove takes an int index, not an Integer$
C
$Nothing happens$
D
$ConcurrentModificationException because the list is modified during a for-each$
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Explanation

Modifying a collection while iterating with an enhanced for-loop triggers ConcurrentModificationException. Use an explicit Iterator or an index-based loop.

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