Explanation: The control of distress traffic fundamentally rests with the entity directly experiencing the emergency. Therefore, the **mobile station in distress** is primarily in control, as they have the most accurate and up-to-date information about their situation and needs. However, situations arise where the distressed station is unable to transmit its own distress call (e.g., due to equipment failure, damage, or incapacitation). In such cases, another **mobile station which sends the distress call** on behalf of the distressed station assumes control. This ensures that even if the primary distressed party cannot communicate, there is an active station coordinating assistance. Option A is incorrect because simply hearing the distress call does not confer control; the station's role is to acknowledge and assist, not to direct the overall traffic. Both B and C represent valid scenarios for who controls distress traffic, making D the comprehensive and correct answer.