Explanation:

- The First National Commission on Labour (NCL) was established to review and recommend policy changes concerning labour laws in India.

- The commission was chaired by Justice P.B. Gajendragadkar.

- It thoroughly examined various aspects of labour management relations and provided suggestions for reform.

- The report was a comprehensive review of the existing labour legislation in India at that time.

Option 1: 1969

- The First National Commission on Labour submitted its report in this year.

Option 2: 1958

- The First NCL was not yet formed in this year.

Option 3: 1999

- This year is associated with the Second NCL but not the first.

Option 4: 1947

- This year is associated with India's independence, predating the formation of the commission.