The storm was so great. Many families had to be evacuated to safer parts of the city.

A. Only when was the storm so great that many families had to be evacuated to safer parts of the city

B. Until many families had to be evacuated to safer parts of the city was the storm so great.

C. Although the storm was not great, many families had to be evacuated to safer parts of the city.

D. So great was the storm that many families had to be evacuated to safer parts of the city.