The correct answer is B) Tactical Control and Routing of Merchant Vessels. The explanation is as follows: 1. Confirm which answer is correct: B) Tactical Control and Routing of Merchant Vessels is the correct answer. 2. Explain the reasoning or regulation that makes it correct: Merchant vessels operating under Naval Control of Shipping are not required to carry the publication "Tactical Control and Routing of Merchant Vessels" on board. This publication is used by the naval authorities to provide guidance on the tactical control and routing of merchant vessels, but it is not a publication that is carried by the merchant vessels themselves. 3. Explain why the other options are incorrect: A) All of the above are carried on board: Incorrect, as "Tactical Control and Routing of Merchant Vessels" is not carried on board. C) Allied Control of Shipping Manual - Guide to Masters: Correct, this publication is carried on board. D) Communications Supplement: Correct, this publication is also carried on board. 4. Keep it concise: The correct answer is B) Tactical Control and Routing of Merchant Vessels, as this publication is not carried on board U.S. merchant vessels operating under Naval Control of Shipping, unlike the other publications listed.