{{B}}quEstions 19 to 22 ArE BAsED on thE ConvErsAtion you hAvE just hEArD、{{/B}}

A．thEir CompEtitors hAvE long BEEn ADvErtising on tv.
B．tv CommErCiAls ArE lEss ExpEnsivE.
C．ADvErtising in nEwspApErs AlonE is not suFFiCiEnt.
D．tv CommErCiAls AttrACt morE invEstmEnts.