In each of the questions given below, read each sentence to find out whether there is any grammatical error in it. The error, if any, will be in one part of the sentence. Mark the part with the error as your answer. If there is no error, mark ‘No error’ as your answer (Ignore the errors of punctuation, if any).
A. The library offers a quiet place when people 
B. can read books, use computers, and attend free
C. workshops to learn new skills and improve 
D. their knowledge about different topics.