.... Besprechung ist im Buro.
C
Correct answer
Explanation
German definite articles must match the gender, case, and number of the noun. 'Besprechung' (meeting) is a feminine noun, and in this context it's in nominative case. The feminine nominative article is 'die'. 'Das' is neuter, 'der' is masculine, and 'Es' is a pronoun meaning 'it'. The sentence translates to 'The meeting is in the office.'