Question about oxy-hemoglobin dissociation curve

[Miracoli]

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The graphs below show pairs of oxygen-hemoglobin dissociation curves.
http://i.imgur.com/uCH3JaN.png
Which one of these diagrams most accurately depicts the oxygen-hemoglobin dissociation curves with solid line for adult hemoglobin with normal Hb concentration(15g/dl) and the dashed line for condition of
Q1) polycythemia Vera
Q2) Anemia due to chronic bleeding
Q3) fetal Hb
Q4) CO poisoning

 

[Robotic Dock]

Q1: E

Q2: B

Q3: C

Q4: A

 

[Miracoli]

Almost there,
Q1: E

Q2: E

Q3: C

Q4: A

Achange in Hb concentration does not affect the oxyhemoglobin dissociation curve if the association of oxygen and hemoglobin is expressed as percent saturation (not as oxygen content) in the y-axis.