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, the number of that part will be the answer. If there is ‘No error’ mark (5) as the answer (Ignore errors of punctuation, if any)

Q:

All banks must (1) / necessary keep a certain (2) / percentage of deposits (3) / with the Reserve Bank. (4) /No error (5).

• 1
  (1)
• 2
  (2)
• 3
  (3)
• 4
  (4)
• 5
  (5)