A:It's in front of the dining hall.
B:It's next to the dining hall.
C:It's on the left of the dining hall.
已知,如图①,△ABC、△AED是两个全等的等腰直角三角形(其顶点B、E重合),∠BAC=∠AED=90°,O为BC的中点,F为AD的中点,连接OF.
下列估测中最符合实际的是( )