In the polar coordinate system, the graph of a polar function 𝑟=𝑓𝜃 is shown with a domain of all real values of 𝜃 for 0≤𝜃≤2𝜋. On this interval of 𝜃, the graph has no holes, the graph passes through each point exactly one time, and 𝑓𝜃 is positive. Over which of the following intervals is the average rate of change of 𝑓𝜃 zero?
(A) 0≤𝜃≤𝜋 
(B) 0≤𝜃≤4𝜋3 
(C) 𝜋≤𝜃≤3𝜋2 