I would say B
Because Dogs cannot talk
The correct answer is:
Upset by Utterson persistence.
Mr. Utterson, who´s the main narrator in the novel, has a rational, calm and curious personality. He is a lawyer and consequently a respectable and prosperous man in Victorian London. All these traits, in addition to his persistence, lead him to discover the truth about Dr. Jekyll and Mr. Hyde's relationship.
The definition of reinforcements is being backed up with examples, facts and statistics to prove your point.
According to English..
:)