what she enjoys-----at the wekends.

一楼二楼说的意思是一样的,简单地说,这句话是这样构成的：
主语是：what she enjoys
谓语是：is
表语是：shopping at the weekend.
一楼说的句子中少谓语,是指如果选A和C的话,整个句子当中少谓语is.所以一楼没错.