The correct answer for 1 is the printing press
The printing press enabled people to print books and pamphlets much easier and faster and cheaper which led to much higher degrees of literacy. People started educating themselves more because access to books was made much easier. It was especially useful for religious people who wanted to get the bible to everyone
The correct answer for 2 is Personal information can be unprotected
Computers help with communication through the use of e-mails or instant messaging services. They actually make business grow because communication and calculations can be done faster. Personal information can be unprotected which can be dangerous for businesses
The correct answer for 3 is the use of automobiles.
Demographic changes are changes that affect how large a population is and how it is segmented. Increase in birth rates and wars affect demographics, while usage of cars is completely unrelated to any demographic change.