In the question given below, a sentence is given, divided into parts. One of the parts may contain an error. Identify the part that contains the error, and mark it as the answer. Ignore errors of punctuation. In case the sentence is correct as it is, mark option (e), that is, 'No error'. Over the last few years, many commentators and economists have revised their scepticism about the demand on MSP entitlement, shifting the debate from why to how.