Traversing ArrayLists

AP Computer Science A· difficulty 3/5

import java.util.ArrayList;
public static ArrayList<Integer> build() {
    ArrayList<Integer> a = new ArrayList<>();
    a.add(1); a.add(2); a.add(3);
    a.add(1, 5);
    a.remove(2);
    a.set(0, 9);
    return a;
}
// Call: System.out.println(build());

What is printed?

A
$[9, 5, 3]$
check_circle
B
$[9, 5, 2, 3]$
C
$[1, 5, 3]$
D
$[9, 1, 5, 3]$

Explanation

Start [1,2,3]. add(1,5) -> [1,5,2,3]. remove(2) removes index 2 -> [1,5,3]. set(0,9) -> [9,5,3].

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