The correct answer is (a). A Hindu wife can adopt a boy and a girl simultaneously without the consent of her husband. This is because the Hindu Adoptions and Maintenance Act, 1956, does not require the consent of the husband for a Hindu wife to adopt a child. The Act only requires the consent of the wife and the child’s guardian, if any.
Option (b) is incorrect because the Act does not require the consent of the husband for a Hindu wife to adopt a child.
Option (c) is incorrect because a Hindu wife can adopt a child, including a boy and a girl.
Option (d) is incorrect because the Act does not require the consent of the husband for a Hindu wife to adopt a child.