The resistant variety of rice, produced by scientists, to bacterial blight is

The correct option is D IR-8
In the 1960s the International Rice Research Institute, headquartered there, developed IR8, a high-yielding strain that significantly increased rice production.The strain IR-8 has proved capable of doubling the yield obtained from most local rices in Asia. IR8 required the use of fertilizers and pesticides, but produced substantially higher yields than the traditional cultivars.The switch to IR8 rice made the Philippines a rice exporter for the first time in the 20th century. But the heavy pesticide use reduced the number of fish and frog species found in rice fields

So, the correct answer is 'IR-8'