ANSWER
c. the level of significance
Step-by-step explanation
We want to identify the correct option.
In order to calculate the p-value, we need to know whether the test is one-tailed or two-tailed and the knowledge of the test statistics.
After the p-value is determined, it is then compared to the level of significance to determine whether the null hypothesis is rejected or not.
Therefore, to compute the p-value, the level of significance does not need to be known.
The correct answer is option c.