Question: What reason did David Quammen believe that On the Origin of Species was weakened in later editions?

Is "James T. Costa said that because the book was an abstract produced in haste in response to Wallace's essay, it was more approachable than the big book on natural selection Darwin had been working on, which would have been encumbered by scholarly footnotes and much more technical detail." the correct answer?
Pick from: (a). yes; (b). no;
(b).