The correct option is B Income
Labour refers to the human capacity to make physical and mental efforts for the purpose of producing goods and services. However, according to economist Alfred Marshall, 'Any exertion of mind and body undergone partly or wholly with a view to some good, other than the pleasure derived from the work is called labour'. It signifies that the activities done out of love, compassion, or pleasure cannot be referred to as labour. Further, labour recognises the aspect of human beings working in return for an income.