The antonym of Docile is:

The question asks for the antonym of Docile. Docile describes someone or something that is easily managed, taught, or controlled; submissive. Therefore, its antonym should convey the opposite meaning: resistance to control or instruction.

• Unyielding (B) accurately captures this opposite meaning, signifying someone who is inflexible, stubborn, and not easily persuaded or controlled.
• Yielding (A), Obedient (C), and Submissive (D) are all synonyms or closely related in meaning to docile, describing someone who readily complies or gives way. Thus, they are incorrect as antonyms.