This was the difference between the saloons on Chicago's main streets $($like Whiskey Row$)$ and those on the side streets which were dominated by a particular ethnic group.

Question $14$ options:

a$)$

The difference is that only particular ethnic groups were welcome on Whiskey Row and all were welcome in the saloons on side streets.

b$)$

There was no difference.

c$)$

The difference is that all ethnic groups were welcome on the main street locations but only those of a particular ethnic group were welcome in the saloons on side streets.

d$)$

The difference was that on Whiskey Row, all were welcome to enjoy the Pan Galactic Gargle Blaster.