Which of the following is a complex sentence?

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

Consider the title and souce of the following articles. which one is most likely to exhibit a bias? (a) how to roast beef," by the food editor of a magazine (b) americans experiencing greater fatigue than previous generations, " by a harvard researcher (c) "americans' worsening eyesight not related to computer screen usage," by the public relations director of a major computer manufacturer (d) "sharing the burden: a history of cooperation," by a college professor