________that the woman could leave her baby with it when going out to attend to other matters. [ ]

A. So faithful the dog was  

B. Faithful so was the dog

C. Faithful so the dog was  

D. So faithful was the dog

以下四个选项中（）是属于搬运的原则，又属于搬运的目标。

A.利用重力的影响和作用

B.提高搬运灵活性

C.消除无效搬运

D.人身和财产安全