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for a method to motivate her failing students, the teacher attempted to implement a different teaching method every four weeks but always obtained the same student performance.
A. for a method to motivate her failing students, the teacher attempted to implement a different teaching method every four weeks but always obtained the same student performance
B. for a method for motivating her failing students, the teacher attempted to implement a different teaching method every four weeks but had always obtained the same student performance
C. to find a method to motivate her failing students, the teacher attempted to implement a different teaching method every four weeks, but had always obtained the same student performance
D. to find a method to motivate her failing students, the teacher attempted to implement a different teaching method every four weeks but always obtained the same student performance
E. for a method to motivate her failings students, the teacher had attempted to implement a different teaching method every four weeks but was always obtaining the same student performance