To find out how many days it would take Daniel to complete 208 problems at a rate of 8 problems per day, we can use the formula:
\[ \text{Number of days} = \frac{\text{Total problems}}{\text{Problems per day}} \]
Substituting in the values:
\[ \text{Number of days} = \frac{208}{8} = 26 \]
So it would take Daniel 26 days to complete 208 problems. The correct answer is:
26 days