rules
programme
project
schedule
Answer is Right!
Answer is Wrong!
The correct answer is A. rules.
A rule is a regulation or principle governing conduct or action. A programme is a set of activities that are planned and carried out in order to achieve a particular goal. A project is a piece of work that is undertaken to achieve a particular aim. A schedule is a plan that shows the order in which things are to be done or events are to happen.
In the context of the question, “No smoking” is a rule that is intended to protect the health of people who are around smokers. It is not a programme, project, or schedule.