Yeasts capable of leavening bread are widespread, and in the many centuries during which the ancient Egyptians made only unleavened bread, such yeasts must frequently have been mixed into bread doughs accidentally. The Egyptians, however, did not discover leavened bread until about 3000 B.C. That discovery roughly coincided with the introduction of a wheat variety that was preferable to previous varieties because its edible kernel could be removed from the husk without first toasting the grain.

Which of the following, if true, provides the strongest evidence that the two
developments were causally related?

A. Even after the ancient Egyptians discovered leavened bread and the techniques for reliably producing it were well known, unleavened bread continued to be widely consumed.
B. Only when the Egyptians stopped the practice of toasting grain were their stonelined grain-toasting pits available for baking bread.
C. Heating a wheat kernel destroys its gluten, a protein that must be present in order for yeast to leaven bread dough.
D. The new variety of wheat, which had a more delicate flavor because it was not toasted, was reserved for the consumption of high officials when it first began to be grown.
E. Because the husk of the new variety of wheat was more easily removed, flour made from it required less effort to produce.

Essentially Egyptians only discovered leavend bread by accident. It was discovered b/c a type of wheat could be eaten much easier. i.e. the kernal did not have to be toasted.

We want something to link this discovery to the leavening of bread.

A: This doesn't help us b/c it doesn't establish a clear link.
B: This seems to be irrelevant. doesn't really establish a link between the new wheat and leavned bread. If the egyptians could not use the pits for the leavned bread, they must have known that the bread could have been made b/f the pits were free.
D: Irrelevant.
E: This may have been an incentive to make leavend bread, but doesn't really establish a link that the two developments were related.

C: Def. establishes a link.
Since the E's no longer had to toast the kernal, this allowed for leavned bread.

one more for C..

OA=C

I somehow wasn't able to digest the information correctly on this one. I know "heating" has something to do with it.

C is the only one that shows relationship between both variables.