Answer:
The correct answer is
A) Ignore them, so you can concentrate on your work
Step-by-step explanation:
It is not good to interrupt someone privacy. It might be an important and urgent call. There might be an emergency and making call be compulsory so if someone is making a private call, it is not a good habit to interrupt him and bother him. Making own work efficient and concentration is far better than taking others matters into consideration.