In social studies, the phrase "is implicitly deleted because the default definition would be ill-formed" refers to a situation where:
A) A historical document is automatically discarded due to inaccuracies in transcription.
B) A legal or social concept is removed from consideration because it is not clearly defined or relevant in the context.
C) An economic model is removed from analysis due to a change in market conditions.
D) A cultural practice is no longer recognized due to changes in societal norms.