Correct Answer: Lucid

Solution : The first option is the correct choice.

The word confused describes a state of being unclear, disordered, or lacking coherence in thought. The most suitable antonym is lucid, which refers to clarity, transparency, and easily understood expression.

The meanings of the other options are as follows:

• Developed means advanced, matured, or brought to a more advanced or effective state.

• Stupid means lacking intelligence or common sense.

• Tangled means twisted together in a confused mass, complicated, or intricately involved.

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Therefore, the correct answer is lucid.