Which numbered sentence is the topic sentence? (1) Defoe narrates the day-by-day adventures of a castaway who passes half a lifetime on a desert island. (2) Fielding spins a complicated plot about Tom Jones, whose difficulties resolve themselves in the final chapters like the parts of a mechanism falling into place. (3) Jane Austen keeps the reader interested in the quiet life of a village where nothing more exciting than a dance or an elopement occurs. (4) James Joyce relates, at great length, the adventures and thoughts of several people in Dublin through a single day. (5) What we call the novel is thus an immensely varied literary form.