GRE General Test: RC-892554 GRE Reading Comprehension

Statement I. From 1983 to 1991, the yearly level of ultraviolet rays, or UVRs, to which the average person was exposed went down considerably.

Statement II. From 1983 to 1991, the occurrence of retinal irritations caused by UVR exposure went up twofold from previous levels, which were already high. This was true for those people whose exposure was average for each year during the eight-year period.

Which of the following, if true, would reconcile the apparent inconsistency between Statement I and Statement II?
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