i'll give brainliest i need an answer right nowww!

i would choose D because it sounds good to me

Step-by-step explanation:

Ionic strength and protein concentration. ... These a-casein polymers increase in sedimentation constant from 4.0 to 5.8 S (8') as the pH is decreased ... If a casein solution at pH 12 and temperatures near 0 adding 100 ml. of 1.5 M potassium oxalate and simultanc- ponents of soluble casein at 8-10" and r/2 = 0.23; KCl-.