Follow the BODMAS/PEMDAS rule. First, solve the bracket: $10 - 2 = 8$. The expression is now $24 \div 4 + 5 \times 3 - 8$. Next, perform division and multiplication from left to right: $24 \div 4 = 6$ and $5 \times 3 = 15$. The expression becomes $6 + 15 - 8$. Finally, perform addition and subtraction from left to right: $6 + 15 = 21$, then $21 - 8 = 13$. So, the correct answer is 13.