C. They made it easier to perform calculations.
ummm question where is the chart so i can answer just send meh a link to it and ill answer
I'm pretty sure the answer is A
One of the ways to assess whether or not a learning game is effective is B. doing a quiz before and after the game to see what you have learned.
The point of a learning game is of course to learn something, so giving your students a quiz before and after the game will show how much they have progressed.