Without being able to see the picture in question, I can't provide a definitive answer. However, I can help you analyze each option based on common historical contexts relating to U.S. involvement in European affairs, especially around World War I or II, when U-boats and passenger ships were significant issues.
A suggests a stance against aggressive naval tactics but may not reflect broader sentiments about engagement in war. B implies a non-interventionist approach, which was a prominent stance before the U.S. entered the world wars. C suggests that patience in staying out of conflicts will eventually yield benefits, a belief held by some during the early stages of both world conflicts. D focuses on a proactive stance against threats posed by German U-boats, which was a significant issue for the U.S. during World War I and was also relevant during World War II.
If you provide more context about the picture or historical setting, I could help you determine which response is most fitting!