A Child's Temperature Was 101

A child's temperature was 101.9°F during a visit to the pediatrician for an ear infection. Three hours after beginning the antibiotic prescribed by the doctor, the change in the child's temperature was -1.5°. What was the child's temperature after beginning the antibiotic?

A) 100.0°
B) 100.2°
C) 100.7°
D) 100.9°
E) 100.4°