Choices (a) and (b) are business organizations, (c) is a service organization, and (d) is a mutual benefit organization. However, commonwealth organizations are basically for social services. They are formed to offer standard services for the majority of the population. The motivator of these organizations is not profit. Police offices, army forces, courts, fire services, and other public institutions are examples of these organizations. The beneficiaries of commonwealth organizations are ordinary people in general. Therefore, choice (d) is the correct answer.