The differences lies in the following expect ______ of the parts.

A．even Americans are surprised at the big differences among themselves
B．there are many differences in character in different parts of the USA
C．there are many reasons for the differences
D．stereotypes about people are not necessarily true

A．New Yorkers are usually open with strangers.
B．People from the South are usually considered good hosts.
C．The friendliest Americans travel from place to place.
D．Different parts have different customs and habits.