The cost (in dollars) of making $b$ bracelets is represented by 4 + 5b. The cost (in dollars) of making $b$ necklaces is represented by 8b + 6. Write a polynomial that represents how much more it costs to make $b$ necklaces than $b$ bracelets.
a) 8b + 2
b) 8b - 2
c) 5b + 2
d) 5b - 2