Concept:Delineation of constituencies means dividing a country into electoral areas for representation.
Explanation:The electoral commission is the independent body that organises and conducts elections.
It also has the duty to define and adjust constituency boundaries to ensure fair representation.
A boundary commission deals mainly with national or state boundaries, not electoral wards.
National assemblies make laws, while political parties sponsor candidates.
Therefore, delineation of constituencies falls under the electoral commission.
Answer:Electoral commission (Option A).