Adam Smith's "invisible hand" refer to

A、thesubtleandoftenhidenmethodsthatbusinessesusetoprofitatconsumers'expense.
B、theabilityoffreemarketstoreachdesirableoutcomes,despitetheself-interestofmarketparticipants.
C、theabilityofgovernmentregulationtobenefitconsumerseveniftheconsumersareunawareoftheregulations.
D、thewayinwhichproducersorconsumersinunregulatedmarketimposecostsoninnocentbystanders.