Final answer:
The correctly used set of homophones in a paragraph is option D, 'friends'. Homophones sound the same but have different meanings, and 'friends' is spelled correctly unlike the misspelled 'freinds'.
Step-by-step explanation:
The question asks which set of homophones is correctly used in a paragraph. Homophones are words that sound the same but have different meanings and often different spellings. In the choices provided, option D, friends, is the correct set of homophones, as "friends" is accurately spelled and "freinds" is a common misspelling of the word. Therefore, when choosing homophones for use in writing, it's essential to select the word with the correct meaning and spelling.