Ummmm if you're voting for the presidential election then the answer is A.) President
The answer is "Christians have a responsibility to take care of the poor and suffering"
This would be a perfect example of the system of barter as you are trading one book for the other. You can see from here what barter is, a trading system which involves direct exchange of goods without some kind of medium of exchange, for example money. Services can also be traded this way.
Answer:
Self-esteem.
Explanation:
I dont know if this is the answer ur looking for but its the one that makes most sense( in my point of view ) hope it helps though. :)