Which Statement Is TRUE About Public- and Private-Employee Unions

Which statement is TRUE about public- and private-employee unions?

A) Only public-employee unions can call strikes, and these unions tend to contribute less for their health insurance premiums.
B) Only private-employee unions can call strikes, while public-employee unions tend to contribute less for their health insurance premiums.
C) Only public-employee unions can call strikes, while private-employee unions tend to contribute less for their health insurance premiums.
D) Only private-employee unions can call strikes, and these unions tend to contribute less for their health insurance premiums.