Topic: Voice,

Best Answer Explained in Below-:

The correct phrase is "The room is filled with smoke" because it uses the preposition "with," which accurately describes the relationship between the room and the smoke. In English, we commonly use "filled with" to indicate that something is occupying or saturating a space. For instance, we can say, "The basket is filled with fruit," clearly conveying that fruit occupies the space in the basket.

Looking at the other options:

A) "The room is filled by smoke" suggests that smoke is the agent doing the filling, which is not the intended meaning. It implies that the smoke actively fills the room, but it lacks the clarity needed to convey the passive nature of the smoke in this context.

B) "The room is filled in smoke" is not grammatically correct in this context. The preposition "in" does not convey the correct relationship, as it typically indicates position rather than an agent causing filling.

C) "The room is filled at smoke" is incorrect due to the preposition "at," which does not appropriately describe the filling action.

Therefore, "The room is filled with smoke" is the clearest and most grammatically correct option, effectively conveying that smoke occupies the space within the room.