A: 4 - util/PerActivityUtil.java

PerActivityUtil.java

@PerActivity
public final class PerActivityUtil {

    private final Activity activity;

    @Inject
    PerActivityUtil(Activity activity) {
        this.activity = activity;
    }

    public String doSomething() {
        return "PerActivityUtil: " + hashCode() + ", Activity: " + activity.hashCode();
    }
}