Step 1: Understanding Polygamy in Hindu Law.
Before the Hindu Marriage Act, 1955, polygamy was legally permitted for Hindus. However, the Hindu Marriage Act, 1955, prohibited polygamy, making it illegal for Hindus to marry more than one person at a time.
Step 2: Explanation of Other Options.
- (b) 1954 and (c) 1955 are incorrect as the law prohibiting polygamy for Hindus was enacted in 1955.
- (d) 1978 is irrelevant in this context.
Step 3: Conclusion.
Polygamy was permitted for Hindus before the year 1956, prior to the enactment of the Hindu Marriage Act, 1955.