I'm not sure what others think, but I think options c and d are absolutely out of the question. You can't make money off of someone else's pattern in any way. I'm not so sure about selling the finished product, but definately not the pattern.
I think option a is the safest, but b might be ok as long as you give credit where due, kind of like citing someone in a paper.
I knit because the voices tell me to
Midwest preemies & babies
Oddball Pet Snuggles
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