Traversing ArrayLists

AP Computer Science A· difficulty 4/5

import java.util.ArrayList;
public static int run() {
    ArrayList<Integer> a = new ArrayList<>();
    a.add(3); a.add(1); a.add(4); a.add(1); a.add(5);
    int max = a.get(0);
    for (int i = 1; i < a.size(); i++) {
        if (a.get(i) > max) max = a.get(i);
    }
    return max;
}
// Call: System.out.println(run());

What is printed?

A
$4$
B
$1$
C
$3$
D
$5$
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Explanation

Maximum of {3,1,4,1,5} is 5.

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