If two circles are concentric then
a) they will have the same area.
b) they will have the same center.
c) they will have the same radius length, but different diameter length.
d) they will have the same diameter length, but different radius length.

two circles are concentric when they will have the same centre

from the figure we get,

the x axis shows   the months and,

the y-axis shows the number of satisfied customer.

each line or each cell in upward direction (y-axis) shows 500.

the appropriate scale for the y - axis is: -

a = 2000 customers

b = 4000 customers

c = 6000 customers

d = 8000 customers

e = 10000 customers

f = 12000 customers

g = 14000 customers

answer: it is d

step-by-step explanation: