Answer: c. use your resources to make cards instead
Explanation:
You had the choice between making banners and making cards. You chose making banners because you thought you stood a better chance of earning returns here.
It did not work out however and returns have not been made in 4 days. It would therefore make sense to go back to the other alternative you had so that you could see if that one works so this incentive will most likely cause you to use your resources to make cards instead.