Answer is B is correct. Muta marriages are temporary marriages and are lawful among shias and completely unlawful among sunnis. Therefore option (b) is the correct answer.

Answer is A is correct. Sunni law prescribes the presence of 2 male witnesses or 1 male and 2 female witnesses during niqah to make it valid. Though under shia no witness is required but they are required during talaq. Therefore option (a) is the correct answer.

Answer is C is correct. Mahr is a sun payable by a husband to wife on marriage by an agreement between the parties or by operation of law. Therefore option (c) is the correct answer.

Answer is D is correct. Justice Mahmood in Abdul Kadir v. Salima states ‘dower under the Muslim Law is a sum of money or other property promised by the husband to be paid or delivered to the wife in consideration of marriage and even when no dower is expressly fixed or mentioned at the marriage ceremony the law confers the right of dower upon the wife.’ Therefore option (d) is the correct answer.

Answer is D is correct. All the given options are objects of providing dower or mahr to a wife by her husband. Therefore option (d) is the correct answer.