Final answer:
It's unclear which experience in 'The Wealthy Mare' corresponds to the options provided as there is no direct reference from the given excerpts.
Step-by-step explanation:
The experience that surprised the narrator in 'The Wealthy Mare' appears to draw a stark contrast between expectation and reality, particularly in relation to wealth and splendor. While instances in the text suggest amazement at opulence or the presence of the unexpected, none of the provided options (a, b, c, or d) precisely correlate with the extracts given. Without a specific extract titled 'The Wealthy Mare', it is challenging to determine which experience mentioned in the assorted excerpts provided directly corresponds to the surprise of the narrator in that context.