Answer:
b and c 
Step-by-step explanation:
Jack popped some popcorn, but 3 of the 150 did not pop.
the ratio of the jack's popcorn = 
                                                    =  
 
                                                    = 1 : 50
We will go through all the other given ratio to find whether they are same ratio of Jack's or not.
a. 2 unpopped out of 75 kernels  = 
                                                        = 2 : 75  This is not a match
b. 2 unpopped out of 200 kernels = 
                                                          = 
                                                          = 1 : 50   This is same
c. 1 unpopped out of 50 kernels = 
                                                      = 1 : 50 This is also same
So b and c has the same ratio of unpopped to total kernels as Jack's popcorn.