A town is located right next to the Ohio River. The local city council approved changes to the building codes about $10$ years ago, which has allowed many homes and businesses to be located in the low$-$lying areas immediately next to the river. River levels rise due to recent weather events, flooding the nearby homes and businesses.

According to Systems Theory, which of the following from the scenario would be considered part of the human$/$social environment?

a$)$ The river

b$)$ The city council and building codes

c$)$ The structures that are the homes and businesses

d$)$ None of the above