In this question has a sentence with three underlined parts labelled (a), (b) and (c). Read each sentence to find out whether there is any error in any underlined part and indicate your response in the Answer Sheet against the corresponding letter i.e., (a) or (b) or (c). If you find no error, your response should be indicated as (d).

The scientists in America
(a) are trying for long
(b) to discover the genes
(c) responsible for ageing.
(d) No error.

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