All India Bar Examination (AIBE) 4-IV Previous Year Question Papers with Answers

The correct option is C: 1948.

This is because the Minimum Wages Act was enacted by the Central Legislative Assembly from the year 1948 and came into force on 15th March, 1948 as the Indian Trade Unions Act, 1948 (16 of 1948). The Act provides for fixing minimum rates of wages in certain employments and defines the rights and liabilities of registered trade unions. 

Option A is incorrect as 1921 was the year when the Trade Union Act was first introduced in the Legislative Assembly, but it was rejected.

Option B is incorrect as 1923 was the year when the Trade Union Act was reintroduced in the Legislative Assembly, but it was again rejected. 

Option D is incorrect as 2007 was the year when the Minimum Wages (Amendment) Bill was introduced in the Lok Sabha, but it lapsed.