Pulling up from work this morning I noticed a gray cat on walkway In front of my apartment . We have several strays so it is n't unusual to see on just lounging about . It was in front of my parking spot so when it did n't run as I was walking toward my apartment I was a little curious .

pick from the following.
(a). There was a mouse nearby ..
(b). They are used to the stray cats running away ..
(c). None of the above choices ..
(d). There was a bird nearby ..
Answer the following question: What may be the reason they were surprised when the stray cat did n't run ?
(b).