The Number of Births in a Certain State Is Shown

Multiple Choice

The number of births in a certain state is shown in the bar graph as a function of the month. What is the domain of this function?

A) {October, November, December, January, February, March, April}
B) {October, April}
C) {(October, 1693) , (April, 2190) }
D) {1693, 1801, 1887, 1872, 1956, 1961, 2190}