A widely cultivated rice variety, which has solved food problem in Asia and has been developed by IRRI manila (Philipines) is

The correct option is B IR-36
By cross-breeding IR-8 with 13 parent varieties from six nations, Dr. Khush developed IR-36, a semi-dwarf variety that proved highly resistant to a number of the major insect pests and diseases that drove down farmers rice yields and raised prices of the staple food for Asian families.

IR-36 matures rapidly 105 days compared to 130 days for IR-8 and 150-170 days for traditional types and produces the slender grain preferred in many countries. The combination of these characteristics soon made IR-36 one of the most widely planted food crop varieties worldwide in just a few years. The variety was one of many of the green revolution, which replaced many local strains and genetic diversity previously found in rice paddies. It was developed by IRRI manila. Thus, option B is correct.