The type of digital telephone service used for transferring large chunks of data to and from the internet without a modem is

ISDN is a digital telephone service that carries large amounts of data to and from the internet without a separate modem.

MSDN is Microsoft's developer resource, not a telephone data service.

TSDN is not a recognised networking or telephone standard.

No other choice fits because ISDN correctly names the digital service described.

ISDN transmits voice and data digitally over ordinary telephone lines.

ISDN stands for Integrated Services Digital Network.