B. will be the opening statement as it is an individual statement as others are supporting according to the subject-verb agreement rule.
D. D adds to the first statement about the uses of NGOs.
F. supports the second sentence D and tells about the edge of NGOs over companies.
E. talk about the opponents of NGOs and companies for which the above-stated statements give the idea.
C. clearly shows the sentence before conclusion as it is mentioned in the beginning of the statement.
A. is the closing statement which tells about the result of the partnership of companies and NGOs.
So, BDFECA is the correct sequence of the sentences.