Select whichever preposition or determiner you consider the most appropriate for the blank space.
This sauce has to be used _______________ 23rd September.

Correct option is A

The word that can be filled in the blank is ‘by’ to make the sentence grammatically and contextually correct.
· ‘By’ is a preposition indicating a deadline or the latest time something should be done. Grammatical rule involved: The preposition ‘by’ is used to denote a point in time before which something must happen.
· As per the context, the phrase ‘by 23rd September’ conveys that the sauce must be used no later than that date, hence it is the correct option.
Meanings of other given words:
· For: This preposition indicates purpose or intended duration but does not imply a deadline.
· Into: This preposition is generally used to indicate movement toward the inside of something and does not apply in this context.
· With: This preposition suggests association or accompaniment and does not convey the sense of a deadline.
· Thus, all the other given words have different meanings and do not fit in the context of the sentence.