Which of the following actions may lead to criminal charges against a driver in Massachusetts?

Answer: B — Refusing to sign a traffic citation

Refusing to sign a traffic citation can indeed lead to criminal charges in Massachusetts because signing the citation is an acknowledgment of receipt of the ticket and does not admit guilt. By refusing to sign, a driver may be obstructing the officer's duties and can be charged with additional violations, such as failure to comply with law enforcement. This action indicates a refusal to engage with the legal process and may escalate the situation. The other actions, while they may carry civil penalties or fines, typically do not rise to the level of criminal charges. For instance, refusing to pay a ticket results in penalties but does not constitute a criminal offense; refusing to wear a seatbelt might lead to a fine, but it's not criminal; and refusing to show vehicle registration can lead to fines but typically would not result in criminal charges unless other circumstances apply.