At the invitation of Kwame Nkrumah, W. E. B. Du Bois settled in Gharla and became the editor of the Encyclopedia Africana.
(A) At the invitation of
(B) When he was invited by
(C) An invitation coming from
(D) An invitation that came from
(E) After having an invitation by
The OA here is also A, and I also chose B. Why is A better than B? Would you please explain why other answer choices are wrong?
thanks