According to the passage, which of the following can be found in the greatest number of different climate areas on Earth

A．Social values play an important role in social change.
B．Social change is more likely to occur in the material aspects of society.
C．Social change is more likely to occur if it comes gradually.
D．Social change tends to meet with more difficulty in basic and emotional aspects of society.

A．they have developed advanced forms of transportation
B．they have learned how to process seawater for drinking
C．their body temperature can vary considerably
D．their shelters and clothing help them to adapt to the environment