Concept:The verb 'listen' is always followed by the preposition 'to'. This is a fixed rule in English grammar.Explanation:We must say 'listen to someone or something'. Option A uses this correct form. Option B incorrectly uses 'towards', which is not idiomatic. Option C omits the preposition entirely, making the sentence incomplete. Option D uses 'of', which is wrong. Therefore, only option A is grammatically perfect and natural. In standard English, certain verbs like 'listen' require a specific preposition to convey the correct meaning.Answer:A. Please listen to your teacher.