GATE CS 2015 Set 2 QGA-10 — General Aptitude

Let us analyze each option to identify the grammatically correct sentence:

• Option A: "Since the report lacked needed information, it was of no use to them."
  This sentence is grammatically correct and uses standard English phrasing and idioms.
• Option B: "The report was useless to them because there were no needed information in it."
  The noun "information" is uncountable, so it must take the singular verb "was" instead of the plural verb "were".
• Option C: "Since the report did not contain the needed information, it was not real useful to them."
  The word "useful" is an adjective, which must be modified by the adverb "really" rather than the adjective "real". It should be "not really useful".
• Option D: "Since the report lacked needed information, it would not had been useful to them."
  The modal auxiliary verb "would" must be followed by the base form of the verb "have", not the past tense form "had". It should be "would not have been".

Thus, Option A is the only grammatically correct and most suitable sentence.