Identify the segment in the sentence, which contains the grammatical error.
The actor smiled to me when I entered the room as if she knew me.

Correct option is A

The segment "The actor smiled to me" contains the grammatical error.
· The correct form should be "The actor smiled at me," using "at" to indicate the direction of the smile towards the speaker, which is a common English usage for such expressions.
· Grammatical rule: "Smile at" is the correct prepositional verb phrase for indicating the action directed towards someone.
· Example: She smiled at me warmly as I entered the room, correctly using "at" to describe the direction of the smile.