Here's a concise analysis of each option:
1. delivered: Too general; lacks specific connotation of fulfilling promises.
2. delivered on: Best choice. Phrasal verb meaning to fulfill promises or expectations. Fits context perfectly.
3. forgot: Implies unintentional oversight. Doesn't match the tone of repeated unfulfilled promises.
4. reneged on: Too strong; suggests deliberate promise-breaking. May be overly harsh for this context.
"Delivered on" is most appropriate as it specifically relates to fulfilling promises without implying malice or forgetfulness.
**from the information given by Claude AI as it is or edited.