TBR Physics Chp 8, Electrostatics and Electromagnetism, Q11 of 25

[defygrav1ty]

Maybe I am missing something, but I don't know why A is correct, not D.
If D=a-b(log M), then shouldn't the graph of distance (D) vs log M increase (a and b are constants that depend on electrophoretic conditions)? The answer, A, is showing a negative slope.

Please help!

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[SN2ed]

Thread closed. These types of questions belong in the Study Q&A forum only.