Which geometric series represents 0.4444... as a fraction?

Which geometric series represents 0.4444… as a fraction?

a) 1/4, 1/40, 1/400, 1/4,000
b) 1/40, 1/400, 1/4,000, 1/40,000
c) 4/10, 4/100, 4/1,000, 4/10,00
d) 1/10, 1/100, 1/1000, 1/10000