Here are four sentences describing Nanjing. Which one doesn’t show cause and effect?

A．Nanjing has so many places of interest that a lot of people come to visit it every year.

B．Since Nanjing is famous for cultural and natural landscapes, we must keep them that way.

C．As a result of many famous universities and schools, Nanjing has been an education centre.

D．The weather in Nanjing is pleasant in autumn, while it is not so comfortable in other seasons.