Answer:
The words "an old-stone savage armed" conveys the speaker's view that building a wall is primitive.
Explanation:
According to a different source, these are the options that come with this question:
In this passage, the author wants to convey the idea that building a wall is a primitive idea. Frost believes that it is possible for neighbours to get along calmly, without the need for a wall. The desire to be separated in order to avoid conflict strikes him as uncivilized. He conveys this feeling through the use of the phrase "an old-stone savage armed."