Geoff planted dahlias in his garden. dahlias have bulbs that divide and reproduce underground. in the first year, geoff’s garden produced 8 bulbs. in the second year, it produced 16 bulbs, and in the third year it produced 32 bulbs. if this pattern continues, how many bulbs should geoff expect in the sixth year?
a. 64
b. 512
c. 128
d. 256