In "wilson's war message to congress" the word "extraordinary" is repeated in order to
a. communicate wilson’s opinion of the united states government.
b. make the message of war as concise as possible.
c. call attention to the greatness of the members of congress.
d. emphasize the importance of the meeting and its special purpose.

The word extraordinary is repeated two times - in the beginning of the  document. President Wilson calls the session extraordinary because the gathering has got such an importance considering the responsibility of the case. Then, in the next paragraph the president calls the announcement extraordinary and explains its purpose. We can observe that the word extraordinary is related with meeting. The correct answer is D.

answer: do

the 'italicized phrase' is a noun clause that is used as a direct object.