A vs. B

I had the same question. Is “B” an incorrect answer because we are told in the passage “nonpurebred dogs rarely suffer from genetically determined abnormalities?” Outside of that, I agree with the with the question above.

I was wondering the same. The conclusion addresses "reduce the risk of incurring costly medical bills" to support choosing nopurebred dogs to purebred dogs. I felt like the argument wasn't acknowledging that nonpurebred dogs could still be seriously ill from non-genetically determined abnormalities. Someone could adopt a purebred dog with an abnormality but general well-being, and a nonpurebred dog with plenty of non-genetic health issues that could be expensive to address/corrected. Being nonpurebred doesn't void the possibility of still having serious and expensive health issues. That's why I thought B was the most appropriate answer...