For each of the following questions, arrange the sentences A, B, C, and D between sentences 1 and 6 to form a logical sequence with sentence 1 and sentence 6 as the starting sentence and the concluding sentence respectively.
(1) Urban problems differ from city to city.
A- As a result most of the cities face a shortfall in drinking water as well as electricity.
B- The population in these cities has grown far beyond what they had been planned for.
C- However, certain basic problems are common to all cities.
D- The number of vehicles on roads has grown at a phenomenal rate in most cities.
(6) And the roads are simply not wide enough to accommodate them.