How does the author use a combination of description and compare-and- contrast structures in paragraph 2 to convey a central idea? A The author compares the frequency of free days at museums with those at other cultural institutions and describes how much more common they are at museums. B The author compares educational events hosted by museums versus those hosted by theaters and describes what the educational events are like. C The author compares the reasons why people visit museums versus other cultural institutions and describes what the benefits of going to a museum are. D The author compares the cost of museums to other cultural activities and describes how museums are more economical.