Based on the fact that the sidewalk is now higher than the rest of the yard even though it was level before the earthquake, the geological feature is A. Scarp.
Scarp refers to the result of an earthquake that will be shown as a rise of an area above other surrounding areas.
The sidewalk rose to a height that was above the rest of the yard which was the surrounding area so this is an example of scarp.
In conclusion, the geological feature observed by your sidewalk rising is scarp.
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