Choose the right option: 'The engineer insists on __ good materials.'

Choose the right option: 'The engineer insists on __ good materials.'

  1. a) use
  2. b) using
  3. c) to use
  4. d) the use

From the BPSC Assistant Programmer (CSE) September 2022 – Preliminary exam, question 6 of 90.

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