The word "acknowledge" is the correct answer because it is the only option that makes sense in the given context. The other options, "Stolen/Wanted," "At Range," and "Coming By Office," do not provide any meaningful explanation or connection to the phrase "10-4." "Acknowledge" is a commonly used term in radio communication, especially in police or emergency situations, to indicate understanding or receipt of a message. Therefore, it is the most logical choice among the given options.