What provides access to the internet; may also be internal.

Answer

Internal Modem

Explanation

An internal modem is an internal   network device that is contained on an expansion board which is plugged into the motherboard of a computer for the purpose of providing  access to the Internet.A Modem which means modulating and demodulating converts digital signals into analog signals in which they can be transmitted through a cable. And it also transforms the incoming analog signals into digital signals.

i think the answer is b.