Why was there no sustained economic growth before modern​ times, that​ is, before​ 1800? ​(Check all that apply.​)A.Increases in aggregate income were offset by increases in​ population, keeping per capita income low.B.People could not easily survive in the subsistence level.C.The pace of technological change was much slower than in modern times.D.There were no national income or product accounts and so there was no way to accurately measure the economy.