yeah it's B.
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Answer:
degree of freedom is 2
Explanation:
We have here,
Physical activity classified as "positive attitude" or "negative attitude"
General activity level was classified as active, mildly active, and inactive.
Degree of freedom (Row-1)(Column -1) = (2-1)(3-1)=2
Therefore degree of freedom is 2
Answer: FDR's ambitious plan transformed the Tennessee Valley by creating dams and reservoirs for electricity and flood control, controlling soil erosion through forest restoration and better farming techniques, and improving navigation and commerce along the Tennessee River.
D,photographs do not give an accurate picture
