what does EC mean, im trying to turn in my extra credit for my high school online classes(i dont know if its like only a high school thing or not) and next to the assignment name it says "EC DO NOT TURN ANYTHING IN" ??

In january 2014 and i started 1 million pennies project she put donation jars in school and shops and set up a webpage to of said donations online her gold was to collect 1 million pennies or 1000 chandra’s planned to give the money to a group called growing food for the group plant gardens and deliver the products it grows to people in need