Question

Can anyone help? I'll give you a medal. Which of these is most responsible for differences from the twentieth century to the twenty-first century?
A. Fuel-efficient automobiles
B. Low-cost computers
C. Solar heating devices
D. Student writing skills

Answer 1

what do you think

Answer 2

hello i need to know

Answer 3

A

Answer 4

why do you think that

Answer 5

i think because gas prices risen in 2013 by 50 cents

Answer 6

Because it's has changed over time by a lot. i'm not really sure what the question means.

Answer 7

So do you think i'm right?

Answer 8

it means i think your right it has changed

Answer 9

Thanks(:
could you help me with some more questions?

Answer 10

I can post them and you can get more medals.

Answer 11

ok

Answer 12

Just posted one.