Question

spotting the error .

we must supplement / (b) our diet with vitamins and minerals / (c) in order to keep/ (d) oneself fit /(e) no error

Answer 1

Hi friend,
in a) we write supply instead of supplement
in d) it is error we should write ourselves instead of oneself

Answer 2

hi there...

in the option  d , there is an error

we must supplement / (b) our diet with vitamins and minerals / (c) in order to keep/ (d) oneself fit

in the option d,

we don't use reflexive pronoun with keep  , so remove oneself .

we use reflexive pronoun according to subject but 

after keep, stop,turn,qualify,bath, move,rest and hide we should not use
reflexive  pronouns

the correct sentence is 

we must supplement our diet with vitamins and minerals  in order to keep  fit.

hope u like it.

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