13 (A) This is the impulse behind the age-old practice of matchmaking. (B)Modern group-maintenance matchmaking still occurs in many cultures, but it usually has less to do with social caste than with other affiliations, such as religion or ethnicity. (C) The selection practices of Internet matchmaking services do not always create happy customers. (D)Especially in cultural traditions that encouraged marriages between 11- or 12-year-old children, this belief was probably true.