Using "to the Telugu film box office" would imply that the result is being directed or aimed specifically at the box office, which doesn't convey the intended meaning. Instead, "for the Telugu film box office" indicates that the result is beneficial or favorable to the box office, which is the appropriate preposition to convey this relationship.
In this month అని రాయాల్సి వచ్చినప్పుడు వాక్యం మారిపోతుంది. ఈ డిసెంబర్ లో అది చాలా ప్రత్యేకం అని ఉన్నప్పుడు అలా రాయాలి. "In this December, it's very special" Both are grammatically correct, but they have slightly different meanings.
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