Punishment for violation of Clause (iii) of Section 5 of the Hindu Marriage Act has been provided in…

Section 18(a) of the Hindu Marriage Act, 1955 punishes a marriage solemnised in contravention of the age condition in section 5(iii) with rigorous imprisonment up to two years, or fine up to one lakh rupees, or both, so the answer is "Section 18(a)". Section 18(b) punishes contravention of the prohibited-relationship and sapinda conditions in section 5(iv) and (v), section 5 itself only lays down the conditions, and section 8 deals with registration of marriages.