Read the following context and choose the best option to answer the question.
Context: 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 .
Question: What may be the reason they have sustained many injuries from the outside world ?
Options: 
- They are too careful and pay too much attention to things they do .
 - None of the above choices .
 - They walk around with protection to make sure nothing happens .
 - They are careless and do nt pay attention to what they are doing .


They are careless and do nt pay attention to what they are doing .