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).

Further investigation is required, (A) / because the issues are to important (B)/ for simply assuming that (C)/persistence and intractability (D) / necessarily imply an organic genesis. (E)