What does the word "laid-off" in the passage mean

A．Subjective.
B．Neutral.
C．Pessimistic.
D．Activ

A．The rate of killing has been accelerating.
B．The US government forbids imports of both raw and finished ivory.
C．They realised that the killing of elephants is a serious threat to their tourist business.
D．African people advocated an ivory ban.