Farm Quilter brought up a point that I want to comment on, that most mysteries don't give you any quidence on fabric. However, I feel that with this lap quilt, you are committing to a significant amount of fabric and at today's prices, even if you have a coupon, it is no small $$$. So I will help if I can without giving away the mystery. I don't want you to hate the result, throw it in the Goodwill box, and put a curse on me for allowing you to use fabrics that wont' work!
But probably some of your sharp shooters out there have already figured this one out --
I had told you to have A-B and C-D look nice together if you aren't using monochromatic. The hint I am giving, and this will be the only hint I will give, is that you will want one of the E-F fabrics to go with the A-B, and the other E-F to go with the C-D.