What did sensationalists say would happen at y2k?

They said the computer bug would cause havoc all around the world in computers and computer networks.

The Y2K bug ( the Millenium bug ), happened based on the assumption that computers would not be able to recognize the two 00 digits as part of the year 2000. This would lead to using incorrect data in various  IT operating systems all over the world.

It was claimed that the bug would cause the failure of software and hardware, causing a massive disruption everywhere. Airports, hospitals, banks, government services, all would close down because of that bug.

The threat turned out not to be real.

some people also thought the world would end

Explanation:

the three roles stated in the dialogue develop the siblings' personalities.

lloyd's personality looks like a trademarketer

dana's personality is afraid from lloyd's behavior and the oldest sister is a decided person who tries to solve any conflict

geography

this is because warmer climates often don't get people sick from the flu and regions where it was often colder more people received the flu. hope this if you need more reasoning i am here to