If you've done your homework with b), an "internetless world" will be inconvenient but you'll easily survive. If you haven't ... you're taking a risk ;-)
Isn't the electricity grid dependent on the Internet? If there's no working Internet, and therefore no grid, almost everything is toast within a few weeks.
For example, here's something you might have been hearing about in the news lately. Back-up generators for nuclear fuel cooling pools are only back-up generators, and won't run for ever. One plant having trouble is bad enough. But all of them? On top of no cash registers or gas pumps working, no food deliveries, etc etc.