In the Past,which of the Following Was a Problem When

Multiple Choice

In the past,which of the following was a problem when purchasing space from newspapers in many cities? 

A)  Page size and column space varied. 
B)  Publication dates were difficult to coordinate. 
C)  Each newspaper required a unique ad. 
D)  Few newspapers printed in color. 
E)  Newspapers did not have enough readers to make advertising worthwhile.