What is the correct understanding of Wehrle's observation? ( )

参考解析：

A选项错误，定位第四段，Wehrle没有明确说空缺率与转化率之间存在关系。B选项错误，定位第四段Since then, temporary lets have not become permanent lets. The key thing is to see if pop-ups start increasing again coming into Christmas.可知，Wehrle并没有说人们会支持弹出式的商铺。C选项定位第五段Wehrle added that because of a surge in popularity of pop-up shops in the run-up to Christmas 2015, 2016 was the first year where vacancy figures had been affected by the closure of some of that type of unit.可知，2015年弹出式商店人气飙升，后提及2016年，表示2016年弹出式商店的增加影响了空置率，因此，2016年是第一次影响空置率的第一年，C错误。故本题正确答案选D。