Final answer:
In an investigation of fires in subway cars in the Jamaica borough, listening for code D: 10-31 would be correct, as this code typically indicates a crime in progress, such as arson. Local codes can vary, so it's important to confirm with local authorities.
Step-by-step explanation:
When investigating a series of incidents involving a homeless person suspected of starting fires on subway cars in Jamaica, a borough of New York, one would listen for a specific code that indicates a fire or a suspect lighting fires. The code you are referring to is likely a part of the New York Police Department's (NYPD) ten-code system, which is a numerical code system used to communicate information quickly and concisely over the radio. However, please note, the codes can vary by city, department, and county. If we assume that a standard set of codes is in use, for fires, one might expect to hear a code that corresponds directly to fire incidents. In this case, the correct signal to listen for would most likely be D: 10-31, which is commonly used to report a crime in progress, including an arson.
It is important to confirm the specific code designation with the local police or transit authority, as radio codes can differ between jurisdictions, and what is true for one area may not be valid in another.