Step 1: Understanding the Concept:
The Constitution of India, under the Seventh Schedule, distributes legislative powers between the Union and the States into three lists: List I (Union List), List II (State List), and List III (Concurrent List). Matters in the Concurrent List can be legislated upon by both the Parliament and the State Legislatures. The question asks about the subject matter of Entry 22 in this list.
Step 2: Detailed Explanation:
Let's examine the entries in the Concurrent List (List III) of the Seventh Schedule.
- Entry 22: "Trade Unions; industrial and labour disputes." This entry directly matches option (C).
- Entry 23: "Social security and social insurance; employment and unemployment." This corresponds to option (A).
- Entry 24: "Welfare of labour including conditions of work, provident funds, employers' liability, workmen's compensation, invalidity and old age pensions and maternity benefits."
- Matters concerning Union employees fall under the Union List.
- Regulation of labour and safety in mines and oilfields is covered under Entry 55 of the Union List (List I).
Step 3: Final Answer:
Based on the constitutional provision, Entry 22 of the Concurrent List explicitly deals with "Trade unions and industrial and labour disputes".