Final answer:
The focus of a study refers to the population or group of people that the study aims to investigate.
Step-by-step explanation:
The focus of a study refers to the population or group of people that the study aims to investigate or gather information from. In the given options, the focus of the study can be a) a specific school, b) a school board, c) elsewhere in the province of Ontario, d) all schools in Canada.
Since the options are related to schools, the subject of this question would fall under the category of Education.
The grade level of this question is College, as it is asking about research methodology which is commonly studied at the college level.