The following table gives the state taxes (in dollars) on a pack of cigarettes for nine states as of April 1, 2020.

State	State Tax (in dollars)
Alaska	2.00
Iowa	1.36
Massachusetts	2.51
Missouri	0.17
New Hampshire	1.33
New York	2.75
Ohio	1.25
South Carolina	0.07
West Virginia	0.55

What is the variable for this data set?

a. State

b. A pack of cigarettes

c. State tax

d. The number of states

e. The sum of state taxes