Directions: The following question consist of a set of four statements. One or more of the statements may have an error of grammar or syntax. Select the statement(s) having the error.

A. One of the first points which strikes us is that individuals of the same variety of our older cultivated plants and animals generally differ more from each other than do the individuals of any variety in a state of nature. B. This great variability is due to our domestic productions having been raised under conditions of life not so uniform as those to which the parent species had been exposed under nature. C. Organic beings must be exposed during several generations to new conditions to cause any great amount of variation. D. When the organisation has once begun to vary, it generally continues varying for many generations.