dou was sick for 2 days . the night b4 , she woke up with a low grade fever of about 37.7 degree . so as usual , the daddy pasted a fever patch on her tiny forehead .

Question with options to choose from: What caused Dou 's father to apply a fever patch to her forehead ?
OPTIONS:
a). None of the above choices .
b). He is being paid to write an Amazon review of the fever patch brand , and is trying it
c). He is testing out a new brand of fever patch to see if it is more effective than the last brand
d). The girl is sick , and this may help treat the symptoms of the illness
d).