Answer:
Option B. 28
Step-by-step explanation:
In this question we have to find the total patients who were seen only for a cold, only an ear infection and only allergies.
From Venn diagram we find that patients seen for only a cold C = 4
Patients seen only for an ear infection E = 9
And patients seen for only allergies A = 15
So total patients = C + E + A = 4 + 9 + 15 = 28
Option B. 28 is the correct answer.
