Plz me

charles and his friends started a community group in 2008 to address problems in their neighborhood and to host civic events. the group began with 40 members, and the number of members changed over time as shown in the graph, where the y-axis represents the number of members and the x-axis represents the number of years since 2008.

which statement is true?

a.

the function indicates that the number of members is increasing at a rate that is constant.

b.

the function indicates that the number of members is increasing at a rate that is not constant.

c.

the function indicates that the number of members is decreasing at a rate that is constant.

d.

the function indicates that the number of members is decreasing at a rate that is not constant.