Answer:
The answer is: A) the employees did not have a reasonable expectation of privacy.
Step-by-step explanation:
Reasonable expectation of privacy is included in the Fourth Amendment, and it refers to certain aspects of a person's life that should be private.
People can usually expect privacy at their homes, but once they are outside things can change a little. The law usually protects people from being exposed to humiliating situations in public or the exposure of private details of their life.
In a workplace, things can get even more trickier, since your employer has the right to "invade" your privacy because he has a legitimate interest to know (e.g. security cameras). In this case the employer notified the employees that their communications would be monitored, so the employees cannot argue that they thought they had a reasonable expectation of privacy.