The correct option is C Tertiary
1. Tertiary sector: These activities help in the development of the primary and secondary sectors. But these activities, by themselves, do not produce a good but they are an aid for the production process.
2. The tertiary or service sector is the one that does not provide any goods. It happens because they are responsible to provide a support system to the other sectors – secondary (manufacturing) and primary (raw material) - sector.