The word "rite" refers to a formal or ceremonial act, often with religious significance.
Sati, being a religious funeral practice in historical India, is best described as a rite.
Other options do not accurately reflect the ceremonial nature of Sati.
(A) \textit{custom} – A repeated cultural practice, but less specific than "rite".
(B) \textit{tradition} – Broader term, may not imply ceremonial or religious act.
(C) \textit{habit} – Personal routine, clearly inappropriate here.
(D) \textit{rite} – Correct; refers to formal religious acts like Sati.