The correct option is
A Sufficient
NOTE: We can clearly understand that the given sentence needs a word that means 'enough'.
Option A - 'Any' is a determiner, which is used to determine a noun that is unspecific in quantity or type. As the 'food' is specifically for the 'fortnight', we can't use 'any'. Also, 'any' doesn't mean 'enough'. Thus option A is incorrect.
Option C - 'Indeed' means 'actually'. It is only used to emphasise what is already suggested. Hence, option C is incorrect.
Option D - 'Many' is a determiner, which is used to determine a countable noun. As 'food' is uncountable in general, we can't use 'many' here. Hence, option D is incorrect.
Option B - 'Sufficient' is a determiner, which means 'enough or adequate'. It can be used for uncountable nouns. The word 'fortnight' explains that the question needs a word that means 'enough' and hence we can use 'sufficient'. Hence, option B is the correct answer.
'Do we have sufficient food for a fortnight?'