Which of the following felonies is classified as a 3rd degree felony?

The correct answer, which is the harassment of a public servant, is classified as a 3rd degree felony because it involves specific actions aimed at individuals who hold public office or are engaged in public service. This classification recognizes the importance of protecting public servants from undue harm and intimidation while fulfilling their duties. The legal framework distinguishes between different types of offenses, considering the nature of the act and the vulnerable position of those in public service roles.

In contrast, offenses like aggravated kidnapping and robbery are more severe in nature, typically classified as higher-degree felonies due to the potential for significant harm and immediate threat to safety. An improper relationship with a student, depending on the circumstances, can also carry varying degrees of severity, but it usually does not reach the threshold for a 3rd degree felony in many jurisdictions.