The correct option is C one / he / any
We commonly use oneas a substitute for a countable noun, here, a secretary. Since the person referred to is a male, third person singular masculine subject pronoun "he" is used, and we use "any" before nouns to refer to indefinite or unknown quantities or an unlimited entity, like number of foreign languages. Hence, Option A is correct. The rest of the options do not adhere to this rule, hence incorrect.