Recall the Application About the Wireless Phone Service Provided by Thousands

Recall the Application about the wireless phone service provided by thousands of entrepreneurial women in Pakistan to answer the following question(s) .
-Recall the Application.Why is the market for phone service perfectly competitive?

A) Thousands of entrepreneurial women in Pakistan sell phone service to neighbors who each take the market price as given.
B) The market for phone service has significant barriers to entry, and many women in Pakistan have trouble getting service due to the shortage in supply.
C) The initial investment would be millions for entering the phone business in Pakistan and will keep the numbers of suppliers low.
D) none of the above