Read each sentence to find out whether there is any grammatical mistake/ error in it. The error, if any, will be in one part of the sentence. Select the part with the error as your answer. If there is no error, select ‘No error’ as your answer. (Ignore the errors of punctuation, if any)
He identified the most important machines required (a)/ for modern life and worked in making a prototype (b)/ ‘do it yourself version of each because he believed that if people (c)/ could build these themselves, it would improve their way of life (d)/ No error (e).
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