Which of these is an example of a simple sentence? select one: the lion in the cage at the zoo is pacing up and down, and the zookeeper is not sure what the problem is. the classic black-and-white movie at the vintage theater downtown was extremely amusing. although he had not slept well at all the night before, marcus scored very highly on the biology test. because she was so incredibly late, ellen missed the opening act at the school’s talent show.