Which one of the following statements does correctly defines the term 'drain theory' as propounded by Dadabhai Naoroji?

1. AThat the resources of the country were being utilised in the interest of Britain
2. BThat a part of India's national wealth or total annual product was being exported to Britain for which India got no material return
3. CThat the British Industrialists were being given an opportunity to invest in India under the protection of the imperial power
4. DThat the British goods were being imported to the country making it poorer day by day