The answer A, is the correct answer. I hope this helps! :D
I believe this can be modeled by the equation:
w=120+5(h-30)
Since people were given the option to "get now and pay later" with credit cards, more purchases were made and more people from every class were able to afford the same things. Consumerism was booming and the economy had a greater circulation of money, which was different to before when only the wealthy had certain things. I hope this answer helps