Do you know when Britain ------- war on Germany during the S

B
Do you know when Britain _______ war on Germany during the Second World War?
—In 1993,I suppose.
A.announced B.declared C.fought D.attended
announce to=declare on：宣布
句意：你知道在二战时英国什么时候向德国宣战的吗?
我猜测在1993年
多谢!