Can someone please explain why D is incorrect? It looks like the contrapositive of the stimulus.

Stimulus: war happen > treaties and military force
D: Less military force > war may not happen

Thanks
Jerry

"SOME or NOT all off the paintings that the board of trustees sells will be among those that the curator recommends selling" You were correct with this version. And actually, it does destroy the argument! Think about it: If not all of the paintings to be sold are the ones the curator reco...