What Statement Accurately Summarizes the Changes in the Distribution of A

What statement accurately summarizes the changes in the distribution of A. arbustorum around Basel between 1900 and 1990?

A) In 1993, A. arbustorum was found at all the same sites surveyed in the early 1900s, but at much lower densities.
B) In 1993, A. arbustorum was not found at 8 out of the 29 sites surveyed in the early 1900s.
C) In 1993, the sites where A. arbustorum was found were cooler and had lower elevations than the sites where the snail was not found.
D) In 1993, 8 of the 16 sites where A. arbustorum was not found had suitable vegetation but were close enough to urban areas to experience higher temperatures.

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