In the following sentences, some segments of the sentence are underlined. Your task is to identify that underlined segment of the sentence, which contains the mistake that needs to be corrected.

Explanation

The error lies in the use of the preposition 'to'. The correct preposition should be 'for', as it indicates the direction or destination of the bus: 'The bus is leaving for the last stop.'The other segments are correct: 'Let's' is a valid contraction, 'The' is the appropriate article, and 'is' is the correct form of the verb 'to be'.