Final answer:
The suspect should be arrested for D. petty theft, as the value of the stolen firearm ($325.00) is below the usual threshold for grand theft. However, they may also face burglary charges because of the unlawful entry into the vehicle. The police may also consider weapon charges if the suspects carried unlawful weapons.
Step-by-step explanation:
The suspect who stole a firearm worth $325.00 from the front seat of an unlocked vehicle should be arrested for petty theft. Petty theft generally refers to the theft of items under a certain value threshold which varies by jurisdiction. In many places, the cut-off between petty theft and grand theft is around $500 or $1000, making a theft of a $325.00 item fall under petty theft.
However, if we consider the burglary aspect, the suspect might also be charged with burglary for entering a vehicle with intent to commit theft. Unlike robbery, which implies taking property from a person through force or fear, the situation described does not involve confrontation or threat, so robbery is not the correct charge in this instance.
In the given scenario of the question, if the police have evidence of carrying an unlawful weapon, both suspects might also face charges related to carrying or possession of an unlawful weapon, aside from any theft charges.