A burning question

The idiom "a burning question" denotes an urgent or significant issue demanding attention making "an important question" the correct choice. "A confusing question" implies lack of clarity "a simple question" suggests ease and "a forgotten issue" indicates irrelevance none of which fit. Idioms like this add expressiveness to English often appearing in discussions or media to highlight pressing matters. Understanding such phrases enhances comprehension of texts speeches or conversations. It’s crucial for engaging with complex ideas or urgent topics in academic professional or social contexts where figurative language conveys significance effectively.