Tertiary economic activities are those that encompass service activities and product trade. It is one of the three sectors of the economy, the others being primary activities (agriculture, mineral extraction, etc.) and secondary activities (industrialization). Services are defined in modern economic literature as "intangible goods". Tertiary economic activities are more common in dominating the economy of developed countries (the same goes for secondary activities), being the most common primary activities in developing countries.
Among the options given in the question above, the country most likely to have its economy dominated by tertiary economic activities is Ireland. Other countries are more likely to have their economy based on primary economic activities.
