The correct answer is D. no article.
The word "honor" is a non-count noun, which means it does not have a plural form and does not take a determiner (such as "a" or "the"). In this case, the speaker is expressing a general feeling of honor, not referring to a specific honor.
Here are some other examples of non-count nouns:
- advice
- furniture
- information
- knowledge
- luggage
- money
- music
- news
- progress
- research
- sand
- sleep
- success
- traffic
- water
- weather
Note that some nouns can be both count and non-count, depending on how they are used. For example, "water" can be a count noun when referring to specific amounts of water, such as "a glass of water" or "two bottles of water." However, it is a non-count noun when referring to water in general, such as "I need to drink more water."
