The author would likely describe the idea that “we can persuade people to save nature by making it possible for them to sell it” as:
B. a fallacy, because if people’s motivation is money, they might sometimes choose money over preserving nature.
This option aligns with the author's critique of measuring nature's value solely in terms of economic benefits, suggesting that this perspective might lead to circumstances where financial incentives take precedence over genuine conservation efforts. The argument highlights a concern that emphasizing the usefulness of nature in financial terms could undermine its intrinsic value.