Questions: Means of Transportation Number(thousands) All workers: 139,260 Automobile: 120,442 Drives self: 105,955 Carpool: 14,487 2-person: 11,139 3-person: 1,963 4+ person: 1,385 Public transportation ^1: 6,801 Taxicab: 179 Bicycle or motorcycle: 949 Walks only: 3,954 Other means ^2: 1,258 Works at home: 5,677

The answer is C: The total number of workers is already included in the table.

Explanation for each option:

A. Some categories would be counted three times - This is incorrect because the table does not indicate any category being counted three times. Each category represents a distinct mode of transportation.

B. Some categories would be counted twice - This is incorrect because the table does not show any category being counted twice. Each mode of transportation is listed separately.

C. The total number of workers is already included in the table - This is correct. The table provides the total number of workers (139,260) at the top, so there is no need to sum the individual categories again.

D. Some categories mean more than others - This is incorrect because the table does not prioritize any category over another; it simply lists different modes of transportation.

E. Not every possible form of transportation is considered - While this might be true, it is not the reason for not including a column total. The table focuses on the most common means of transportation, and the total number of workers is already provided.