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. "it is obvious today that america has defaulted on this promissory note." b. "instead of honoring that sacred obligation, america has given the negro people a bad check which has come back marked 'insufficient funds.' " c. "in a sense we've come to our nation's capital to cash a check." d. "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. "