The crime of obstructing public service refers to the act of hindering the performance of official duties by means of the threat of violence.
According to the above definition, which of the following acts is a crime of obstructing public service?
Ye Mou, an accountant of a certain company, was accused of embezzlement. The procurator went to Ye company to audit the accounts. Yang, the inspector, tore up the cover of an account book because he was angry. The manager of Ye company was very dissatisfied with this, quarreled with Yang and took back the account book