Bob believes that the city has someone drive by his house in an ambulance every day to make sure that he is home, and he is afraid to leave home because he "knows" the ambulance will follow him. what type of delusion would this be called?

It is called delusions of persecution. Persecutory delusions are an arrangement of whimsical conditions in which the influenced people trust they are being mistreated. In particular, they have been characterized as containing two focal components. This is the most well-known type of hallucinations in suspicious schizophrenia, where the individual trusts "he or she is being tormented, taken after, deceived, kept an eye on, or scorned