The answer is the letter B
The statement that is a key difference between market economy and mixed market economy is this: Market economies have no government influence while mixed market economies are loosely regulated by the government. Hope this is the answer that you are looking for.
Here is a list.
* The Market Economy
* The secondary industry
* Culture
* birthrate
* economical/economic activity
* and soooo much more!!!
* Just google it.
The base is an 8 by 8 cubic inch square. 409.6/6.4= 64, and the square of 64 is 8.
B is the best answer.
I hope this helps! :)