Let's define the number of seats in band as \( b \) and the number of seats in choir as \( c \). According to the problem, we know that:
- \( c = 4b \) (There are four times as many seats in choir as in band)
- The total number of seats available is 250: \( b + c = 250 \)
Now, we can substitute the first equation into the second equation:
\[ b + 4b = 250 \]
This simplifies to:
\[ 5b = 250 \]
Now, divide both sides by 5:
\[ b = \frac{250}{5} = 50 \]
So, the number of students that can choose band is 50 students.
Thus, the correct answer is:
50 students.