Problem 11 - Entrance Test

This sentence consists of two independent clauses: 'She couldn't believe her luck' and 'she won the lottery!' The second clause acts as a dramatic explanation or amplification of the first. A dash (em dash) can be used effectively to indicate a sudden break in thought or to emphasize an explanatory statement. A colon would also be grammatically correct here, but the dash adds a sense of immediacy and drama. A semicolon would also be technically correct, but the dash is more emphatic for this kind of dramatic reveal. Option D, the em dash, is the best fit for the dramatic emphasis.