Direction: Read the given sentence to find out whether there is any grammatical/contextual error in it. The error, if any, will be in one part of the sentence. If no part in the sentence has an error then, mark 'No Error' as your answer. Consider the part in bold as grammatically correct. (Ignore punctuation errors, if any).

Great improvements, however, / have been affected in the design of openly fireplaces, (A)/ and many ingenious contrivances of (B)/ this nature are now in the market which (C)/ combine efficiency of heating with economy of fuel. (D)/ No error (E)