The correct answer is A. 25 years.
The minimum age to become a Member of Halqa Panchayat of Jammu and Kashmir is 25 years. This is as per the Jammu and Kashmir Panchayati Raj Act, 1989. The Act states that a person shall not be eligible for election as a member of a Panchayat unless he/she is a citizen of India, has completed 25 years of age on the date of nomination, is ordinarily resident in the Panchayat area for a period of not less than 2 years immediately preceding the date of nomination, and is not a member of any other Panchayat.
The other options are incorrect because they are not the minimum age to become a Member of Halqa Panchayat of Jammu and Kashmir.