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Roy Wilkins was among the last of a generation of civil rights activists who led the nation through decades of change so profound many young Americans are not able to imagine, even less to remember, what segregation was like.

A	so profound many young Americans are not able to imagine, even less to remember
B	so profound that many young Americans cannot imagine, much less remember
C	so profound many young Americans cannot imagine nor even less remember
D	of such profundity many young Americans cannot imagine, even less can they remember
E	of such profundity that many young Americans are not able to imagine, much less to remember

Use more concise terms like "so profound" instead of "of such profundity".

"cannot" vs "not able to"

"much less" vs "even less to"

Slips of the tongue do not necessarily reveal concealed beliefs or intentions but rather are the result from the competition between various processing mechanisms in the brain.

A	but rather are the result from
B	and instead are the result from
C	being rather the result of
D	and rather result from
E	but rather result from