The standard set on the assumption of conditions that recognise an element of imperfection is known as:

A. Ideal standard
B. Basic standard
C. Current standard
D. Attainable standard
E. Favourable standard

D. Attainable standard

Explanation:
The correct answer is option D, “Attainable standard.”
Explanation: Attainable standards consider normal working conditions, including expected inefficiencies, and are more realistic compared to ideal standards, which assume perfect conditions without inefficiencies.