Instructions: In this task, you need to provide the correct option for a given problem on probability from the provided options.
Input: Problem: a question paper has 2 parts , a & b , each containing 8 questions . if a student has to choose 8 from part a & 4 from part b , in how many ways can he choose the questions ? 
Options: a ) 110 , b ) 70 , c ) 120 , d ) 130 , e ) 140
Output:
b