I have sustained many injuries from the outside world . My house is n't much safer . I run into walls , i trip over toys . I once tripped over one of Brady 's toys and slammed into the doors that hide my washer and dryer .

Available options: (I). I have a medical condition that affects my balance . (II). None of the above choices . (III). I am a parapalegic . (IV). I am addicted to drugs that are mind altering .
Q: What is the reason I sustain so many injuries ?
(I).