Answer:
working with someone to build a house
Explanation:
Out of all of the options listed the one that is an example of a positive-sum game is working with someone to build a house. This is because you are collaborating with another individual equally and all decisions and actions affect both of you equally. Therefore, if you win/profit you would both be winning/profiting at the same time, the same goes for losses. In such a game you one would not profit without the others profiting as well.
