Attitudinal complaints are often related to the attitude and behaviour of hotel staff. Guests may experience issues when staff members are rude, unprofessional, or unhelpful.
- Equipment and service are important aspects of hotel operations but are not typically linked to attitudinal complaints.
- Accident may lead to complaints, but it is not directly related to attitude or behaviour, which are the primary causes of attitudinal complaints.
Thus, the correct answer is Attitude; behaviour.