Which of the following is a complex sentence?

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

Claim and evidence is the answer

Prewriting: this stage of the writing process involve gathering and selecting ideas; teachers can students in several ways: creating lists, researching, brainstorming,reading to discover more about the author's style, talking, collecting memorabilia or clips from other texts, and free-writingdrafting: in this stage, students begin writing, connecting, and developing ideasrevising: this is the stage of writing that involves rewriting or "re-seeing; " emphasis is place on examining sentence structure, word choice, voice, and organization of the pieceediting: this stage involves checking for style and conventions--spelling, grammar, usage, and punctuationpublishing: the "going public" stage of writingevaluating: in this stage, the writer looks back at his/her work and self-evaluates, and the audience evaluates the effectiveness of the writingwriting activities : personal writing, workplace writing, subject writing, creative writing, persuasive writing, and scholarly writingpeer review: acting a referee; evaluating a colleague's work professionally