Which sentence best expresses the main idea of paragraph 6?
A. “On the basis of her research, Baumrind has recommended that parents who want to raise competent, socially responsible, independent children should do several things.”
B. “Teach by example, that is, behave the way you want your children to behave.
C. “Reward behaviors you want to encourage and punish behaviors you want to discourage, giving explanations in both cases.”
D. “Demand achievement and the meeting of standards, while being open to hearing the child’s point of view”.

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21 balloons is the story of professor william sherman's travels.

in 1883, he set off from san francisco for a balloon ride over the pacific and was found a month later floating with 21 balloons in the atlantic ocean. this seemed an astounding feat and everyone wanted to know what had happened.    

professor sherman was loyal, however, and said he would tell his tale first to the western american explorers club in san francisco, of which he was a member. this built up suspense for several chapters before he began to tell of the wonders of his adventures and the amazing island of krakatoa, an island which had just been blown up by a volcano.  

the residents of krakatoa are all millionaires who live under a "gourmet government" of their own devising. we get to see all the incredible adventures that creative people with unlimited resources would create according to the author.

black citizens were denied access to the same public facilities as whitesun.

marriages between white and nonwhite citizens were forbidden.

nonwhite citizens were required to carry identification papers with them at all times.