Which one among the following statements appropriately defines the term drain theory' as propounded by Dadabhai Naoroji in his work 'Poverty and un-British Rule in India'?

Options

A. That a part of India's national wealth or total annual product was being exported to Britain for which India got no material returns
B. That the resources of India were being utilized in the interest of Britain
C. That the British industrialists were being given an opportunity to invest in India under the protection of the imperial power
D. That the British goods were being imported to India making the country poorer day by day