What evidence does dr. king use in paragraph 4 of his "i have a dream" speech to prove that african americans have rights that are being denied to them? a. "in a sense we've come to our nation's capital to cash a check." b. "when the architects of our republic wrote the magnificent words of the constitution and declaration of independence, they were signing a promissory note to which every american was to fall heir. " c. "it is obvious today that america has defaulted on this promissory note." d. "instead of honoring that sacred obligation, america has given the negro people a bad check which has come back marked 'insufficient funds.' "