You are given a suspension of bacteria and told that it contains 1.6 x1010 viable cells per ml. How many 100-fold serial dilutions would you carry out so that 0.5 ml of the final dilution would contain approximately 80 viable cells? Circle one.

a. 3 

b. 4

c. 5

d. 6

e. 7

f. 8

g. 9

h. 10

i. None of these above