A disk-diffusion test using E. coli gave the following results:  Disinfectant         Zone of inhibition (diameter in mm)       A                                    15       B                                    2.0       C                                    10       D                                    5   In the table above, which compound was the most effective against E. coli?       A) A       B) B           C) C       D) D                       E) The answer cannot be determined based on the information provided.

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