Though unemployment during the Great Depression was widespread, it was higher in some parts of the United States than in others. How might a microhistorian and a comparative historian use different methods to study this topic?

a. A microhistorian might graph unemployment levels in several cities throughout the Great Depression, while a comparative historian might document one day in a town that experienced particularly high unemployment levels.
b. A microhistorian might interview only members of a specific subgroup of unemployed people, while a comparative historian might count all the unemployed people in a single city during one year of the Great Depression.
c. A microhistorian might document one day in a town that experienced particularly high unemployment levels, while a comparative historian might graph unemployment levels in several cities throughout the Great Depression.
d. A microhistorian might count all the unemployed people in a single city during one year of the Great Depression, while a comparative historian might interview only members of a specific subgroup of unemployed people.