It is said that silkworms were first raised by a woman in _____ is now Hebei Province. [ ]

A. which

B. that

C. where

D. what

乙因涉嫌诈骗罪被监视居住，在监视居住期间，两次未经批准，擅自离开执行监视居住的处所，公安机关可以对其提请批准逮捕，提捕前可以对其先行拘留。