The number of tokens Eric used in the arcade must be less than or equal to the total number of tokens he received, which is 73. Therefore, the correct inequality that represents the number of tokens Eric used is:
B. \( x < 73 \)
However, if we also consider the possibility that he could use all 73 tokens, the more inclusive expression would be \( x \leq 73 \). But based on the provided options, since they all seem to suggest that he used fewer tokens than he received, the only valid one is option B.
Note: The correct interpretation should point out that if strictly using fewer tokens is considered, using inequality less than ( \( < \)) is generally what you would expect. But in reality, it can also be \( \leq \) for usable tokens including the maximum, which isn't provided.