Use the Figure Below to Answer the Following Question

Multiple Choice

Use the figure below to answer the following question. Between what two decibel readings is the least change in power output found? (Hint: assume that db readings were taken at the following points: 11, 13, 15, 17, 19, 21, 23, 25)

A) 13 db and 15 db
B) 23 db and 25 db
C) 19 db and 21 db
D) 15 db and 17 db
E) 11 db and 13 db