According to the passage, firms with slack security are subject to______.

A．Six months ago.
B．Three months ago.
C．One year ago.
D．Two years ago.

A．An overall rise in blood pressure and heart rote.
B．There is no change in blood pressure and heart rate.
C．A drop in blood pressure but a rise in heart rote.
D．An overall drop m blood pressure and heart rote.