Step 1: Understand the context of Hindu Law reforms.
After India's independence, the government undertook a major reform of Hindu personal law. This led to the passage of a set of four laws known as the Hindu Code Bills.
Step 2: Recall the different Acts and their years.
These four major acts were passed in the mid-1950s:
(A) The Hindu Marriage Act, 1955.
(B) The Hindu Succession Act, 1956.
(C) The Hindu Minority and Guardianship Act, 1956.
(D) The Hindu Adoptions and Maintenance Act, 1956.
Step 3: Identify the correct year.
As seen from the list, the Hindu Minority and Guardianship Act was enacted in the year 1956.