Choose the option that best expresses the same sentence in indirect speech.
I said to him, "Does your sister know French?"

Correct option is B

The correct indirect/ direct speech is (b).
Explanation: Yes/No questions in indirect speech take asked + if/whether + clause with statement word order (Subject + Verb) and backshift when the reporting verb is in the past. Present simple knows becomes knew; the question mark and auxiliary do/does disappear.
Rules of conversion (Direct → Indirect for Yes/No questions):
· Reporting verb: said to → asked (for questions).
· Linker: if/whether (either is fine; whether is slightly more formal).
· Word order: Interrogative → Declarative (S + V).
· Tense backshift: If reporting verb is past (said), present simple → past simple.
· Pronoun/time changes as needed by context.
· Why others are incorrect:
· (a) Uses said to instead of asked and no backshift (knows).
· (c) No backshift (knows) despite past reporting verb.
· (d) told is not used for asking questions; use asked.
· Example:
· Direct: She said to me, “Do you play chess?” → Indirect: She asked me whether I played chess.