Step 1:
Given a bag contains 8 red and 5 white balls
$\therefore$ The sample space is $S=13(8+5)$
Step 2:
All three balls are red
$P=\large\frac{8}{13}\times \frac{7}{12}\times \frac{6}{11}$
$\;\;\;=\large\frac{28}{143}$
Hence (B) is the correct answer.