To solve the equation \(30 \div x = 50\), we can interpret it in the context provided.
Given:
- Stephen paid $30 for 50 nails, and if we denote \(x\) as the cost per nail, the equation rearranges to calculate \(x\):
\[ x = \frac{30}{50} \]
Thus, \(x\) represents the cost per nail.
Therefore, the best statement that describes the solution to the equation is:
C. It represents the cost of each nail Stephen bought.