Records from 1850 to 1900 show that in a certain region, babies’ birth ... ...

Records from 1850 to 1900 show that in a certain region, babies’ birth weights each year varied with the success of the previous year’s crops: the more successful the crops, the higher the birth weights. This indicates that the health of a newborn depends to a large extent on the amount of food available to the mother during her pregnancy.

The argument proceeds by


(A) inferring from a claimed correlation between two phenomena that two other phenomena are causally connected to one another
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in PT71 (Dec 2013): Logical Reasoning A