‘P’ will be the first part of the given sequence as ‘a person bitten’ forms the subject. ‘R’ will follow next as it states that the person would be seized by violent symptoms after a period of incubation. ‘Q’ will come next because it shows the effect of being bitten by a rabid dog, that is, the person would be in the grip of violent symptoms. ‘S’ will be the last part of the given order because it tells the ultimate result of the happenings, that is, death of the person. Hence, PRQS is the correct sequence.