The question is about the legal benefits available for persons with disabilities in India.

Option 1 states that there is free schooling until the age of 18 at government-run schools. This is correct, as under The Rights of Persons with Disabilities Act, 2016, free and compulsory education must be provided for children with disabilities until 18 years of age.

Option 2, which talks about preferential allotment of land for setting up businesses, is also correct. The above mentioned Act provides for incentives, including land at concessional rates, to persons with disabilities to start their own ventures.

Option 3 mentions ramps in public buildings, which is, again, correct. The Act stipulates that public buildings should be made accessible through additions like ramps to promote inclusivity.

Understanding all these points, we conclude that the correct answer is Option 4, "1,2 and 3", meaning all the statements are accurate benefits available to persons with disabilities under Indian law.