As per the information given in the passage above, what has been the primary impediment in India-Russia trade?

• A. Indian government may be susceptible to fall prey to any external restrictions.
• B. Engagement of the countries which are equally interested in extending their trade and business networks
• C. List of companies and persons under restrictions can be extended at any moment.
• D. Paucity of independent banking infrastructure connecting India and Russia.
• E. None of these