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Phineas decided to build a tree house in the tree in his backyard. He had finished making the walls and the roof and the last step was to put in the door, but he was having a difficult time fitting it perfectly onto the door frame. The door sides kept chafing on the door frame. To fix this, he should ____.

A use a finishing tool (plane) to fine the sides of the door
Planes are used to finish doors and fit them into frames.
B make sure the wood material is intended for door purposes
C replace the door
D varnish the sides of the door very well