What is the not the consequence of Smoot-Hawley Tariff Act?

A、IthelpedtheU.S.economytorecoverfromGreatDepressionandacceleratesthegrowthofbusinessintheU.S.;
B、Thisactpromptedretaliation.OthercountriesimplementedsimilaractionsagainsttheU.S.;
C、Tradeprotectionwereadoptedinmanycountriestoavoidnegativeimpactfromabroad,thisissocalled“beggar-thy-neighbor”.;
D、Internationalretaliatorymovesledtoadramaticdeclineinthevolumeofworldtrade.