The correct answer is A. irresponsible.
A gatekeeper is a person who is responsible for controlling access to something. In this case, the gatekeeper is responsible for controlling access to a place or a group of people. If the gatekeeper is irresponsible, they may not do their job properly and allow people who should not be there to enter. This could lead to problems such as crime or violence.
The other options are not correct because they do not describe the gatekeeper’s job. B. ignorant means not knowing something. C. careless means not paying attention to what you are doing. D. innocent means not guilty of a crime.
It is important for gatekeepers to be vigilant because they are responsible for the safety of others. If they are not vigilant, they could put people at risk.