Study the following information carefully and answer the questions that follow. Agriculture remains a dominant economic activity in many West African countries, contributing significantly to employment and national income. (a) Define the term 'subsistence agriculture'. (2 marks) (b) Outline FOUR characteristics of subsistence agriculture as practised in West Africa. (8 marks) (c) Explain THREE ways in which subsistence agriculture can be transformed into commercial agriculture in West Africa. (6 marks)