Find out the correct sentence from the following options:

Concept: The adjective "indebted" follows a fixed two-part prepositional pattern. The person to whom something is owed is introduced with "to", and the thing owed is introduced with "for" — the full pattern is "indebted to <person> for <thing>".

Application: Here the sentence expresses owing thanks to a person for the help they gave. The helper is the person, so it takes "to" (indebted to you); the help is the thing owed, so it takes "for" (for your help). Combining the two gives "I am indebted to you for your help."

Contrast:

• "indebted on you ... for your help" — "on" cannot mark the person after "indebted"; only "to" can.

• "indebted of you by your help" — both prepositions are wrong: the person needs "to" (not "of") and the thing needs "for" (not "by").

• "indebted to you with your help" — the person is marked correctly with "to", but the thing owed needs "for", not "with".

Cross-check: Replacing "indebted" with the close synonym "grateful" gives "grateful to you for your help", which uses the same to/for pairing — confirming the pattern.