ds1-6答案错了吗？

ds1-6答案错了吗？

6.    363-!-item-!-187;#058&000183

On the number line above, is the product of w, x, y, and z negative?

(1) z is positive.

(2) The product of w and x is positive.

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【答案】

但是我觉得是B 啊？因为WX同号， YZ 也同号啊