the increased size of the telephone book the increase in use of modems, fax machines, and cellular phones the increase in use of speed dialing and call waiting the increased demand for telephone repairs and installation
I gave my students this multiple choice question: Recently the telephone company announced the implementation of a new telephone area code for Massachusetts. What technological changes are responsible for the need for a new area code?

Only one answer is correct among these 4 choices:
- the increased size of the telephone book
- the increase in use of modems, fax machines, and cellular phones
- the increase in use of speed dialing and call waiting
- the increased demand for telephone repairs and installation

Could you tell me which one is correct?

the increase in use of modems, fax machines, and cellular phones