Step 1: Understand the concept of Separation of Powers.
The doctrine of Separation of Powers refers to the division of government authority into three branches — Legislature, Executive, and Judiciary — to prevent concentration of power.
Step 2: Identify the constitutional source.
The Indian Constitution adopted this doctrine from the United States Constitution, where a clear separation among the three organs of government exists.
Step 3: Eliminate incorrect options.
(A) British Constitution: Follows parliamentary sovereignty, not strict separation of powers.
(C) Canadian Constitution: Influenced India in federal structure, not separation of powers.
(D) Irish Constitution: Influenced Directive Principles, not this doctrine.
Step 4: Conclusion.
The doctrine of Separation of Powers in the Indian Constitution is borrowed from the US Constitution.