Fathima sings very well; ______ she has a sweet voice.

Correct option is B

 • The sentence emphasizes that she sings well because she truly has a sweet voice.

• “Indeed” is used for emphasis or confirmation.

• Correct sentence:
Fathima sings very well; indeed she has a sweet voice.

Meanings of other options:
• even though / although – show contrast (not suitable here)
• instead – shows replacement

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