Final answer:
The correct option is (d) Round character, as it describes a believable and realistic character in literature that is complex and capable of growth or change, which aligns with E.M. Forster's definition.
Step-by-step explanation:
The term round character is used to describe a complex, multi-dimensional character in literature that is developed over the course of the story, showing a range of emotions and traits. Round characters are realistic and believable, often experiencing growth or change that makes them dynamic. According to E.M. Forster, a key aspect of a round character is its ability to surprise readers in a convincing way, having what he describes as the 'incalculability of life.'
A flat character, on the other hand, is one-dimensional and does not undergo significant development or change; they are often used to represent a single idea or trait. Forster mentions that flat characters are not inherently negative; they can serve a purpose within a narrative by acting as a contrast to more developed, round characters.
When evaluating the options provided in the question, it is clear that option (d) Round character is the correct answer. The given definition in the question aligns with Forster's description of a round character as one that is both convincing and capable of surprising the reader, indicating a three-dimensional and dynamic character.