Final answer:
Marco's termination of a case due to insufficient evidence is called a stay of proceedings, which is the dismissal or pause of legal charges by the prosecution. The correct option is b.
Step-by-step explanation:
Marco, as a crown prosecutor, deciding to terminate a case due to a lack of evidence is engaging in what is known as a stay of proceedings. This legal action dismisses or pauses a case or charges against the defendant, and it can occur at any point in the judicial process if the prosecution feels there is insufficient evidence to obtain a conviction or if continuing with the case is considered to not be in the public interest.
Such an action is different from a plea bargain, which involves the defendant agreeing to plead guilty in exchange for a more lenient sentence or lesser charges. It is also not associated with discovery evidence disclosure, which pertains to the exchange of evidence between the prosecution and defense during the pre-trial phase.
Hence, Option b is correct.