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The learning rate for new skills is proportional to the difference between the maximum potential for learning that skill, $M$, and the amount of the skill already learned, $L$.$\newline$Which equation describes this relationship?$\newline$Choose $1$ answer:$\newline$(A) $L(t)=\frac{k}{(M-L)}$$\newline$(B) $L(t)=k(M-L)$$\newline$(C) $\frac{d L}{d t}=k(M-L)$$\newline$(D) $\frac{d L}{d t}=\frac{k}{(M-L)}$