The correct option is A b
The option that has an error, is the correct option.
Option B: The
error lies in part (b): 'listen what'. The word 'to' is missing.
We always use the verb 'listen', followed by the preposition 'to'.
This is because 'listen' is an intransitive verb, i.e. it does not take a direct object. Intransitive verbs take prepositional objects, like 'to me, to something, to what one says'.
So here, the object will be 'to what you say'.
The correction is 'listen to what'.
Hence option B is the correct option with the error.
The other parts (a) and (c) do not have any error in them. They are grammatically correct and are complete in meaning.
Hence options A and C are not the right answers.
Option D is incorrect because the sentence has an error (b).