To solve the inequality \( 2.50b \leq 30 \), we first divide both sides by 2.50:
\[ b \leq \frac{30}{2.50} \]
Calculating the right side:
\[ \frac{30}{2.50} = 12 \]
This means that \( b \) must be less than or equal to 12. Therefore, the possible whole numbers for \( b \) are 0 through 12.
The options presented are:
A. 10
B. 11
C. 12
D. 13
Among these, the ones that meet the criteria \( b \leq 12 \) are:
- A. 10
- B. 11
- C. 12
Option D. 13 does not satisfy the inequality.
Thus, the correct answers are A (10), B (11), and C (12).