Errington and Gewertz are critical of Diamond's larger argument in Guns, Germs and Steel because they think it is based in part on a flawed conception of human nature. Where did Diamond go wrong, in their view?
a. They think that Diamond is wrong in assuimg that all societies strive to produce cargo.

b. They think that Diamond is wrong in assuming that New Guineans had no cargo of their own when the Europeans arrived.

c. They think Diamond is wrong in his assumption that any society, given certain geographic advantages, will inevitably try to dominate or conquer weaker societies.

d. They think that Diamond is wrong in assuming that Europeans were smarter than New Guineans.