Reason (R) states that ghee was conspicuous and high-priced in the diet of early Tamils. Assertion (A) provides evidence for the widespread use of ghee by both vegetarian and non-vegetarian diets, citing ancient Tamil poets/texts (Ayur Mulankilar and Purattinai Nannaganar, likely referring to Sangam literature poets). The fact that ghee was used freely across different dietary habits and was mentioned in literature indicates its significant presence (conspicuousness) in the diet, supporting the statement in R. While A doesn't directly explain why it was high-priced, its widespread use and mention in literature are evidence of its importance, consistent with it being a valuable commodity.