Fill in the blanks with suitable prepositions:
A preposition is a word which comes before a noun or a pronoun and establishes a relationship between the elements of a clause or words. Option B)during/ for is correct as during and for mean through and a specific duration respectively. The other options are wrong as at and since indicate a specific location and a duration which has its starting point given respectively and at cannot be used in the second blank (irrelevant). These uses don't fit in the given question. The correct answer is B)during/ for.