Urban population grows and the effects of climate change worsen. Therefore, our cities have to adapt.

A.Our cities have to adapt if urban population grows and the effects of climate change worsen.

B.As the urban population grows and the effects of climate change worsen, our cities have to adapt.

C.Our cities are always adaptive to urban population growth and the effects of climate changes.

D.Urban population growth and effects of climate changes are worsening, which make our cities more adaptive.