Correct option is A
Option (a) is the correct order of the given sentences.
Why ABCD is correct:
· A (Subject): “my mother” — subjects usually come first.
· B (Verb): “bought” — follows the subject to form an SV core.
· C (Object): “a beautiful saree” — the direct object naturally follows the verb to form SVO.
· D (Adverbial of time): “yesterday” — time expressions typically appear at the end: S + V + O + (Time).
· The result “My mother bought a beautiful saree yesterday.” is grammatically and stylistically standard English (adjective “beautiful” correctly pre-modifies the noun “saree”).