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'prerequisite'

  • A.Unnecessary
  • B.Required
  • C.Optional
  • D.Secondary

Answer: B

The word nearest in meaning to 'prerequisite' is required.

A prerequisite is something that must exist or be done before something else can happen, a necessary condition. As an adjective it means required beforehand, as in 'a prerequisite course'.

'Unnecessary' and 'optional' are close to its opposite, since a prerequisite is precisely what cannot be skipped. 'Secondary' means of lesser importance, which also misses the sense of necessity.

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