Which of the following statements is not the reason that Hollywood became an ideal place for American movie industry?

A、SouthernCaliforniaofferednearlyyear-roundsunshineandwarmweatherforoutdoorshooting.;
B、Theareaprovidedauniquephysicalenvironment:mountains,desert,acityandthesea.;
C、LosAngeleswaswellknownatthetimeasthenation’sleadingopen-shop,nonunioncity.;
D、LongbeforeHollywoodbecameamoviepowerhouse,itwasfamousforitsadvancedeconomy.