A. In the old society, the acrobats wandered the streets all year round, and they suffered from cold and hunger

B. In the old society, because the acrobats wandered the streets all year round, they suffered from cold and hunger

C. In the old society, the acrobats had to wander about in the streets all the year round, suffering from cold and hunger

D. In the old society, the acrobats wandered the streets all year round, so they suffered from cold and hunger