Answer
$A'\cup B \cup C$={Acme,Brothers,Crafts,Dion,Effigy,Floyd,Global Hilbert}
Work Step by Step
The subset described can be put in a form $A'\cup B \cup C$
$A'$={Brothers,Dion,Floyd,Hilbert}
Use the definition of union to find $A'\cup B \cup C$
$A'\cup B \cup C$={Acme,Brothers,Crafts,Dion,Effigy,Floyd,Global Hilbert}