The correct option is B Flat red spots that appear on the face at the hairline and spread downward to the neck, trunk, arms, legs, and feet.
Measles symptoms appear 10-14 days after exposure to the virus some of which includes fever, dry cough, runny nose, inflamed eyes or conjunctivitis, tiny white spots with bluish-white centers on a red background found inside the mouth on the inner lining of the cheek - also called, Koplik's spots and lastly, a skin rash made of large, flat blotches that often flow into one another.
Thus, the correct answer is option (B), 'Erupting of small red spots and inflammation of mucous membrane of nose'.