(A)they were not nearly as high as the early 1980s, when --> wrong comparison: as high as "the early 1980s" (comparison with year)
(B)they were not nearly as high as interest rates in the early 1980s, when--> correct comparison of interest rates
(C)they were not nearly at the levels they were in the early 1980s, at the time when --> "at the time when" repeats the sense of the 1980s
(D)they had not approached the high levels of the early 1980s, during the time
...
(B)they were not nearly as high as interest rates in the early 1980s, when--> correct comparison of interest rates
(C)they were not nearly at the levels they were in the early 1980s, at the time when --> "at the time when" repeats the sense of the 1980s
(D)they had not approached the high levels of the early 1980s, during the time
...
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