A和B一个意思 怎么就选B了呢？仍旧没看懂

NO.PZ2017100901000003 问题如下 Prielasticity of manfor a goowill most likely greater if: A.there are no substitutes for the goo B.consumers consir the gooscretionary. C.consumers spena small portion of their buet on the goo B is correct.Prielasticity of manis likely to greater for items thare seen optionor scretionary.考点影响需求价格弹性的因素。解析影响需求价格弹性的因素有四点Availability of substitutes指替代品容易获取程度，商品容易获取弹性大，不容易获取则弹性小。Relative amount of income spent on the goo商品花费占收入比。比重大弹性大。比如买房子。Time sinthe prichange.商品价格变化后的时间，价格改变后时间越长，消费者的机动性越大，弹性越大。Whether the gooor serviis seen to scretionary or non-scretionary商品是否是必须需要的。如果消费可以砍掉，那么弹性就比较大。B正确 老师，能具体下这一点吗，讲课时候就没太听懂。Time sinthe prichange.商品价格变化后的时间，价格改变后时间越长，消费者的机动性越大，弹性越大。

NO.PZ2017100901000003问题如下Prielasticity of manfor a goowill most likely greater if: A.there are no substitutes for the goo B.consumers consir the gooscretionary. C.consumers spena small portion of their buet on the goo B is correct.Prielasticity of manis likely to greater for items thare seen optionor scretionary.考点影响需求价格弹性的因素。解析影响需求价格弹性的因素有四点Availability of substitutes指替代品容易获取程度，商品容易获取弹性大，不容易获取则弹性小。Relative amount of income spent on the goo商品花费占收入比。比重大弹性大。比如买房子。Time sinthe prichange.商品价格变化后的时间，价格改变后时间越长，消费者的机动性越大，弹性越大。Whether the gooor serviis seen to scretionary or non-scretionary商品是否是必须需要的。如果消费可以砍掉，那么弹性就比较大。B正确同上

NO.PZ2017100901000003 consumers consir the gooscretionary. 没懂这句话什么意思 能再顺便解析一下这个题吗

consumers consir the gooscretionary. consumers spena small portion of their buet on the goo B is correct. Prielasticity of manis likely to greater for items thare seen optionor scretionary. 考点影响需求价格弹性的因素。 解析 影响需求价格弹性的因素有四点 Availability of substitutes指替代品容易获取程度，商品容易获取弹性大，不容易获取则弹性小。 Relative amount of income spent on the goo商品花费占收入比。比重大弹性大。比如买房子。 Time sinthe prichange.商品价格变化后的时间，价格改变后时间越长，消费者的机动性越大，弹性越大。 Whether the gooor serviis seen to scretionary or non-scretionary商品是否是必须需要的。如果消费可以砍掉，那么弹性就比较大。B正确 为啥选b没懂，感觉之前评论里不太懂，麻烦了

consumers consir the gooscretionary. consumers spena small portion of their buet on the goo B is correct. Prielasticity of manis likely to greater for items thare seen optionor scretionary. 考点影响需求价格弹性的因素。 解析 影响需求价格弹性的因素有四点 Availability of substitutes指替代品容易获取程度，商品容易获取弹性大，不容易获取则弹性小。 Relative amount of income spent on the goo商品花费占收入比。比重大弹性大。比如买房子。 Time sinthe prichange.商品价格变化后的时间，价格改变后时间越长，消费者的机动性越大，弹性越大。 Whether the gooor serviis seen to scretionary or non-scretionary商品是否是必须需要的。如果消费可以砍掉，那么弹性就比较大。B正确 为啥选b没懂，感觉之前评论里不太懂，麻烦了