Jan provided links to the description of the "A" and "C" files. There are no "B" files.
Up until the passage of the Cable Act (Sept 22, 1922), women derived their citizenship from their husband, so your grandmothers would have automatically become citizens when your grandfathers naturalized in 1921. There would be no separate files for them, but they (and any minor children) should be listed on the naturalization petitions.
Although the naturalization documents sometimes list AKA names, it is best to list all the names that the immigrants were known as.
HYMAN/HEYMAN/HEIMOWITS/CHAJMOVITS: Zemplen-Dobra, Hungary > New York
KLEIN: Satoraljaujhely (Ujhely), Hungary > New York > Los Angeles
KRONOWITH: Hungary > New York
OSEAS/OSIAS/OSIASI/OZIAS: Iasi, Romania > Chicago > Milwaukee > Los Angeles
SCHECHTER/SHEKTER: Kishinev, Bessarabia > New York
SHERMAN: Iasi, Romania > New York > Los Angeles
STRUL: Iasi, Romania > Haifa, Israel
WICHMAN: Syczkowo (Bobruisk), Belarus > Milwaukee > Los Angeles