During an Oral Assessment of a 30-Year-Old African-American Patient,the Nurse

During an oral assessment of a 30-year-old African-American patient,the nurse notices bluish lips and a dark line along the gingival margin.What would the nurse do in response to this finding?

A) Check the patient's hemoglobin for anemia.
B) Assess for other signs of insufficient oxygen supply.
C) Proceed with assessment, knowing that this is a normal finding.
D) Ask if he has been exposed to an excessive amount of carbon monoxide.