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【单选题】
下图是从北半球某点O上空观测的地球俯视图,圆ABCD是黄道面与地球表面的交线,圆AECF为赤道(虚线表示视线被阻挡的部分),两圆相切于A、C两点,弧AC与弧BD相交于O点,且O点均为弧AC与弧BD的中点。 有关说法正确的是 ①O点位于北极圈上  ②弧BE值变化范围为0°~23.5° ③春分日,昼弧是弧ECF  ④夏至日,弧OA是晨线
A.
①②       
B.
②③     
C.
①④      
D.
③④
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