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

the correct answer is the following.

one of the groups i belong to is the boy scouts. this is a problem-solving group because it has tasks that we need to solve in order to other people in different activities such as the rescue of lost pets, or elder people in need.

the other group i belong to is kids pro environment, and is an information-sharing group that tries to create conscience about the risks and problems that generate pollution in our cities. we share information to other students and parents on the importance of keep our communities clean and our skies clear.