W: It's nearly ten o'clock. Let's listen to the weather forecast. M: Here is the weather forecast: Fog is spreading from the east and it'll affect all areas by midnight. It will be heavy in some places., Question: What's the weather forecast? (A) There will be heavy fog in all areas. (B) There will be heavy rain by midnight. (C) There will be fog in all areas by midnight.
(C) There will be fog in all areas by midnight.