Final answer:
The correct answer is (a) recentis, as it is a Latin root potentially providing etymology for the English word 'recent', which is the study of word origins and development.
Step-by-step explanation:
The question seems to be centered on finding the option that provides readers with historical information about the origin and development of a word, commonly referred to as its etymology. Among the choices provided (a) recentis, (b) while agg, (c) recently, and (d) centre, recentis is a Latin word that relates to the history and origins of the English word recent. Etymology deals with the study of the history of words, their origins, and how their form and meaning have changed over time. Therefore, choice (a) recentis is the correct answer because it refers to a Latin root, which often provides etymological insight for words used in the English language.