When would you use the informal (sometimes called the colloquial) level of standard english usage

Read this excerpt from the lady of shalott by alfred, lord tennyson. in which three lines does the poet reveal the monotomy of the lady’s existence

Aids is growing fastest in the poorest countries of africa. these nations don’t have enough doctors, medical labs, or money for medicine. a recent study showed that only a small percentage of hiv-infected children in africa are getting any medical treatment at all. what central idea is emphasized in both sources? the hiv/aids epidemic in africa is serious. the hiv/aids epidemic in south africa is serious. the hiv/aids epidemic among african children is serious. the hiv/aids epidemic among south african children is serious

What is the narrator's main conflict in this passage? a. he doesn't like someone mispronouncing his name. b. he has a history of beating up kids he doesn't like. c. he has a violent temper that he cannot control. d. he doesn't like "the kid" he mentions in the paragraph.