Flo did not hear about the event until thursday she had been out of town.

which revision most effectively corrects the fused sentence?

flo did not hear about the event until thursday, she had been out of town.

flo did not hear about the event having been out of town until thursday.

flo, not hearing about the event until thursday, had been out of town.

flo did not hear about the event until thursday because she had been out of town.