The correct form of the verb estar for the sentence "They are in the car" is "están".
The correct form of the verb estar that would be used in the sentence "They are in the car" is: "están".
To correctly choose the form of the verb "estar" that would be used in the sentence "They are in the car", we need to consider the subject of the sentence, which is "they". "They" is a plural pronoun, so we need to use the plural form of the verb "estar". The correct form of the verb "estar" in the third person plural is "están".
