Which sentence does not contain any errors?

a.
two salesladies worked in the mens' department.

b.
two salesladies worked in the men's department.

c.
two salesladie's worked in the mens department.

d.
two salesladies' worked in the men's department.

The arizona department of transportation wishes to survey state residents to determine what proportion of the population would like to increase statewide highway speed to 75 from 65 mph. at least how many residents do they need to survey if they want to be at least 99% confident that the sample proportion is within 0.09 of the true proportion?

What did the leaders of the soviet union feel would provide the most protection for their country

What is the best definition of economic data?