I'm sorry if I sound frustrated but I have written this multiple times. 

LLC B is a multi member LLC and files a 1065. I assume what you meant is, does the owner of LLC B file a 1040, but in light of the above it should be obvious they do not. 

The individual involved in all of these ventures (real estate if you are curious) files a 1040 and has the K1 from LLC B on his return. 

He can't put LLC A as a schedule C because LLC B is the intermediary that owns LLC A. 

I don't  know if I can make this any clearer, but maybe there is something I am missing? I hope not because LLC B's return as well as the individual's has already been e-filed.