The correct option is B Such services will surely promote our tourism sector.
The purpose of the sentence is to convey how the tourism industry can be benefited by certain services. Services cannot be collectivised as sectors, hence Option A is incorrect. Option C is incorrect because it is the services which will promote the tourism sector, not the other way round. Option D means the same as Option C. Therefore, Option B, which means that the tourism sector will be benefited by such services, is correct.