The correct answer is A. informal.
An acrimonious person is one who is always angry and argumentative. They are often quick to anger and can be very difficult to get along with. As a result, their neighbors are likely to be aware of their acrimonious nature and avoid them as much as possible.
The other options are not correct because they do not describe the nature of an acrimonious person. A sympathetic person is one who is understanding and compassionate. A cooperative person is one who is willing to work together with others. A charitable person is one who is generous and giving. None of these qualities are associated with an acrimonious person.