Use the Figure Below to Answer the Following Question

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: 18, 20, 22, 24, 26, 28, 30, 32)

A) 24 db and 26 db
B) 20 db and 22 db
C) 22 db and 24 db
D) 30 db and 32 db
E) 20 db and 26 db