A BOD test was ran using 3 dilutions of the sample. Which of the following dilutions give the most valid results? Sample A: Sample size 3ml, Initial DO-7.9, Final DO-7.0 mg/l, BOD Volume-132mg/l, Sample B: 6 Sample-6 ml, Initial DO-7.9 mg/l, Final DO-3.9 mg/l, BOD Volume-222 mg/l, Sample C: 8 ml, Initial DO-7.7 mg/l, Final DO-0.0 mg/l, BOD Volume-250 mg/l, Sample D: 9 ml, Initial DO-7.9 mg/l, Final DO-6.3 mg/l, BOD Volume-270 mg/l