WhichofthefollowingisNOTmentionedbyKarelwhenreferringtothebigchallengesthatChinaisfacingforthemanufacturingindustry？以下哪一个不是Karel提到的关于中国制造业面临的巨大挑战之一？
B
B.Explosion of SKUs 对产品多样性的需求激增
C
C.More complicated supply chain 供应链更加复杂
D
D.Rising population 人口增长
