If three bags of birdseed cost $14.16, how much will 14 bags cost?
a. $33.71
b. $66.08
c. $30.34
d. $70.80

All the information's required for solving this problem is already given in the question.
The cost of 3 bags of birdseed = 14.16 dollars
Then
The cost of 1 bag of birdseed = (14.16/3) dollars
So
The cost of 14 bags of birdseed = (14.16/3) * 14 dollars
                                                    = 198.24/3 dollars
                                                    = 66.08 dollars
So from the above deduction we can see that the correct option is option "B". The cost of 14 bags of birdseed is $66.08. I hope the procedure is clear enough for you to understand.