In the given question, a part of the sentence is printed in bold. Below the sentence alternatives to the bold part are given at (A), (B), (C) and (D) which may help improve the sentence.
The empire-builders benefited from impeccable timing: the characteristic warm, wet and stable weather was conducive to economic productivity at an agrarian society.

Options

A. productivity at an agrarian
B. productivity in an agrarian
C. productivity at the agrarian society
D. productive at an agrarian