Answer: b) A proofreading error
Explanation:
Proofreading error is the issue that occurs when final level of editing on any content is not done through checking spellings, punctuation mistakes,grammatical mistakes etc.
According to the question,statement in email message received by branch manager persist proofreading mistakes which includes spelling errors, punctuation mistakes and other surface errors.
Other options are incorrect because grammatical error, unsuccessful in using spelling check or error-less sentence is not depicted through emails message statement.Thus, the correct option is option(b).
