Answer:
D
Step-by-step explanation:
The treatment in the case given is the testing of the fertilizers. For portions labelled A : Old fertilizers, B : New fertilizers , C : No fertilizers.
Each and every soil is treated with 3 different fertilizers at each and every type of soil, the results are interpreted from harvest of soybeans
The slope is:8
Because
M=rise/run
Or
Y2-Y1/X2-X1
Sooo…
-8-0/-3-(-2)
Or 8
Hope this helps:)