The correct answer to the question is option 2: 1 and 2 only.

Let`s break down each option for better understanding:

1. Germany and Russia blocked flight restrictions sought by Britain and France: This means that Germany and Russia did not agree to impose flight restrictions on Libya, despite the efforts of Britain and France. This disagreement contributed to the failure of reaching an agreement on military action.

2. French attempt for a no-fly zone could not reach consensus: This option suggests that France proposed the idea of a no-fly zone over Libya, but the foreign ministers could not reach a consensus on this matter. The lack of agreement on this proposal also played a role in the failure of the G-8 nations to agree on military action.

3. United Nations has been non-supportive for any kind of action against Libya: This option implies that the United Nations did not support any form of action against Libya at the time. It suggests that the UN`s lack of support may have influenced the failure of the G-8 nations to come to an agreement.

From the above analysis, options 1 and 2 contribute to the failure of reaching an agreement, while option 3 does not provide any concrete evidence to support its inclusion. Therefore, option 2 (1 and