The correct answer is - d. Europeans.
Ecuador and Peru are countries in which the population is predominantly consisted of the native populations and the mestizo population (mixture of native people and Europeans), while the people with direct European ancestry are relatively rare.
Despite the very small number of Europeans in these two South American countries, they are highly and not proportionally represented into the highest sectors. The Europeans actually are occupying the highest and most profitable positions, so they also control the biggest portion of the money and power in Ecuador and Peru.