Option 1: (B), (C), (A), (D) -> Forms "The task of the special committee was to put a brake on the accelerating spread of the highly contagious disease in vulnerable states" - grammatically correct and meaningful.
Option 2: (A), (D), (C), (B) -> Creates a fragmented sentence with improper structure and no clear subject-verb agreement.
Option 3: (D), (B), (A), (C) -> Results in a jumbled sequence that lacks logical flow and grammatical coherence.
Option 4: (C), (A), (D), (B) -> Begins with "was to" without establishing the subject first, creating an incomplete sentence structure.
Hence, Option 1: (B), (C), (A), (D) -> This arrangement correctly establishes the subject ("the task of the special committee"), followed by the verb phrase ("was to put a brake on"), and then the object ("the accelerating spread of the highly contagious disease in vulnerable states"), creating a complete and meaningful sentence about the committee's objective to control disease spread -> correct