English - Sentence Correction
- Option : D
- Explanation : 'Navigators, calendar makers' are best clubbed under the category of 'observers' rather than 'scrutinizers', as the latter term is more used to refer to specialists in a particular field. 'Students' can also fit to a certain extent and this leaves us with options (b), (d). 'Concede' has more to do with defeat or revision which is more apt in this context than 'agree' or 'conclude'. Hence, option (c) is correct.
