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According to Newton's Second Law of Motion, the sum of the forces that act on an object with a mass $m$ that moves with an acceleration $a$ is equal to $m \cdot a$. An object whose mass is $80$ grams has an acceleration of $20$ meters per seconds squared. What calculation will give us the sum of the forces that act on the object, in Newtons (which are $\frac{\text{kg} \cdot \text{m}}{\text{s}^2}$)?$\newline$Choose $1$ answer:$\newline$(A) $80 \cdot 20$$\newline$(B) $80 \cdot 1000 \cdot 20$$\newline$(C) $\frac{80}{1000} \cdot 20$$\newline$(D) $\frac{80}{60^2} \cdot 20$