Robert has a collection of 26 fishing lures, and Lucy has a collection of 34 fishing lures. Robert is adding 4 new lures per month to his collection, while Lucy is adding 2 new lures per month to her collection. After how many months will Robert and Lucy have the same number of fishing lures?
a. 4 months
b. 5 months
c. 6 months
d. 8 months