10.
The answer is: A
Explanation
The correct option is A: Uniformity.
The word "zonation" refers to the arrangement or formation of zones, often in an ecological context, where different zones represent different environmental conditions or characteristics. The antonym of "zonation" would imply the absence of distinct zones, meaning a state of uniformity or sameness throughout. "Uniformity" fits this description, as it means the quality or state of being uniform, without variation or differentiation.
The other options do not fit the meaning of an antonym for "zonation":
"Mansion" refers to a large, impressive house.
"Feign" means to pretend or fake something.
"Booth" refers to a small, temporary structure or enclosure.