A wife has an implied authority of the husband to buy articles of household necessity:

Correct option is A

Under the law of agency, a wife is considered to have implied authority to pledge her husband’s credit for necessaries when she lives with him in a domestic establishment. This concept is rooted in agency by necessity.
The principle is that cohabiting spouses share mutual obligations, and the wife is presumed to act as the husband's agent in buying essentials.
Information Booster:
· This implied authority ceases if she is living separately without cause, or if a suitable allowance is provided.
· Case law: Manby v. Scott (1663) – foundation case on implied agency of wife.