In this task, you need to provide the correct option for a given problem on probability from the provided options.

Input: Consider Input: Problem: a child want to buy 3 new toys . if there are 10 toys that satisfy the child ' s criteria , in how many different ways can the child select the 3 new toys if the order of selection does n ' t matter . 
Options: a ) 20 , b ) 120 , c ) 210 , d ) 15 , e ) 45

Output: b


Input: Consider Input: Problem: two unbiased coins are tossed . find the probability of getting two heads ? 
Options: a ) 1 / 2 , b ) 1 / 3 , c ) 1 / 4 , d ) 2 / 3 , e ) 3 / 5

Output: c


Input: Consider Input: Problem: in how many ways 4 boys and 3 girls can be seated in a row so that they are alternative ? 
Options: a ) 120 , b ) 144 , c ) 160 , d ) 210 , e ) 180


Output: b