Which of the following is a complex sentence?
a. i would like to visit the kinshasa, but i understand the city is unsafe for foreigners.
b. check out the editorial page in today's paper and you'll notice the piece by george will.
c. as jake was reading the email from june yet again, the flight attendant coughed gently to get his attention.
d. i simply cannot make heads or tails of rap lyrics, but i suppose i'm just too old to understand them.

How does this passage contribute to the overall meaning of the story

Which lines from the speech best supports this topic sentence? and as we walk, we must make the pledge that we shall always march ahead. we cannot turn back. there are those who are asking the devotees of civil rights, "when will you be satisfied? " and they have come to realize that their freedom is inextricably bound to our freedom. we cannot walk alone. we refuse to believe that there are insufficient funds in the great vaults of opportunity of this nation. and so we've come to cash this check, a check that will give us upon demand the riches of freedom and the security of justice. and so let freedom ring from the prodigious hilltops of new hampshire. let freedom ring from the mighty mountains of new york. let freedom ring from the heightening alleghenies of pennsylvania.

The empire state building was a.constructed by one hundred workers. b.was first lit up by president roosevelt. c.has more than one hundred stories. d took several years to complete.