gmat逻辑问题

gmat逻辑问题
原文：
Several ancient Greek texts provide accounts of people being poisoned by honey
that texts suggest was made from the nectar of rhododendron or oleander plants.
Honey made from such nectar can cause the effects the texts describe, but only
if eaten fresh, since the honey loses its toxicity within a few weeks of being
made. In Greece, rhododendrons and oleander bloom only in springtime, when they
are the predominant sources of nectar.
　　Which of the following, if true, most strongly support the accounts of
Greek texts?
　　A. There are no plants that Greece in ancient times that produce more
nectarthan rhododendrons or oleanders does.
　　B. In areas where neither rhododendrons no roleanders grow, honey is never
poisonous.
　　C. A beebive’s honeycomb cannot have some sections that contain toxic honey
and other sections that contain nontoxichoney
　　D. The incidents ofhoney poisoning that are related in the ancient texts
occurred in the springtime or in the early summer
　　E. Whether the honey in a beehive is toxic depends solely on which plants
were the source of that was used to make the honey.
答案是D,可是B不正是无因无果型加强吗?大神们帮忙解释下吧