Final answer:
The correct answer is 'b) Contrite,' which is a synonym for remorseful, adds three letters to 'trite,' and has the same Latin origin as 'trite.'
Step-by-step explanation:
The question is asking for a synonym for remorseful that not only adds three letters to the word "trite" but also originates from the same Latin root. Among the given options, the correct answer is b) Contrite. The word 'contrite' adds three letters to 'trite' and both words come from the Latin word 'contritus,' meaning 'ground to pieces, or worn out by rubbing.' Contrite has a definition that aligns with being remorseful or feeling guilt or sorrow for one's actions. Although 'penitent' and 'repentant' are synonyms for remorseful as well, they do not fit the clue about the word's length in relation to 'trite.'