Which of these is most responsible for differences from the twentieth century to the twenty- first century? a. fuel- efficient automobiles b. solar heating devices c. student writing skills d. low- cost computers

The correct answer is D. Low-cost computers

Explanation:

The twenty-first century represented multiple changes in comparison to the twentieth century and to the previous centuries, this occurred as the twenty-first century implied globalization processes along with the massive use of technology, advances in science and massive world population grown. One of the main factors that were responsible for these changes was the creation of the computer by the end of the 20th century and then the creation of low-cost computers that were accessible to almost everyone around the world, as this technology allowed people, companies, and governments to be in contact with others all around the world and increased the trade, which lead to globalization and also, the creation of more technological devices. Therefore, from the options provided the one that was most responsible for differences from the twentieth century to the twenty-first century is low-cost computers.

d.he wanted to send diplomats to communist countries.