Based on the given excerpt, the author's tone is best described as:
B. enthusiastic and optimistic.
The author describes a personal experience of riding in old Baltimore, expressing a sense of joy and excitement. The use of words like "heart-filled" and "head-filled with glee" suggests a positive and enthusiastic tone. The author's encounter with a Baltimorean looking straight at them does not inherently convey a negative or foreboding tone in this particular excerpt.

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