Suppose you are told that the average wingspan of an American robin is 35 cm and you want to test this out for the robins in your area. You capture 40 robins to use as your sample and find that the mean wingspan of your sample is 37 cm. If you were going use your data to test the claim that the average wingspan is not 35 cm, how would you write out the hypotheses in symbols? 

A. H₀: μ = 37 cm, H_a: μ ≠ 37 cm 

B. H₀: μ = 35 cm, H_a: μ ≠ 35 cm 

C. H₀: x? = 37 cm, H_a: x? ≠ 37 cm 

D. H₀: x? = 35 cm, H_a: x?  ≠ 35 cm