Answer Choices
- A. forgivable: Small or minor; this contradicts the idea of "scrupulous" editors who would specifically target major errors.
- B. flagrant: (Correct) Glaring, obvious, or conspicuously offensive.
- C. uncommon: This describes the frequency, not the nature of the lapse itself.
- D. atypical: Not representative of a type; doesn't fit the context of error severity.
- E. egregious: (Correct) Outstandingly bad or shocking.
- F. apparent: Visible, but lacks the connotation of being "bad" or "erroneous" in the way egregious does.

Final Selection
The correct answers are B (flagrant) and E (egregious).
In the context of GRE Sentence Equivalence, these two words are classic synonyms. Both describe something that is "glaringly bad." Using either word completes the sentence to mean that while minor errors might have slipped through, the most conspicuous syntactical blunders were once rare in professional print.