
Passage: Compared with small and medium-sized cities, especially small towns, the cost of living in big cities is higher, which inevitably limits the entry of rural population. Therefore, urbanization cannot actually be achieved by developing big cities alone.
Question: Which of the followings must be assumed in the conclusion?
A. A.Urbanization is the only way for the development of our country.
B. B.The simple development of big cities is not conducive to the promotion of urbanization.
C. C.In order to realize urbanization, cities must fully absorb the rural population.
D. D.The attractiveness of large cities to non-local rural population is significantly lower than that of small and medium-sized cities.
Answer: