The manifesto’s reference to “beautiful ideas worth dying for” was most likely influenced by which of the following nineteenth-century intellectual movements?

To answer this question, we need to know what the question is referring to. However, based on the information given, it seems like the question is asking about a specific line in a manifesto that refers to "beautiful ideas worth dying for". This line could be influenced by several intellectual movements from the nineteenth century.

Here are the steps to answer this question:

1. Identify the Manifesto: The first step is to identify which manifesto the question is referring to. There were many manifestos written in the 19th century, each with its own unique influences and ideas.

2. Understand the Quote: The next step is to understand the quote "beautiful ideas worth dying for". This quote suggests a strong belief in certain ideals or principles, to the point of being willing to die for them.

3. Research 19th Century Intellectual Movements: The next step is to research the various intellectual movements of the 19th century. Some of these might include Romanticism, Realism, Transcendentalism, and Marxism.

4. Match the Quote to the Movement: The final step is to match the ideals suggested by the quote to the ideals of these movements. For example, the Romantic movement placed a high value on emotion and individualism, which could align with the idea of having personal beliefs worth dying for.

Without more specific information about the manifesto in question, it's difficult to give a definitive answer. However, these steps should help guide you towards finding the answer.