The graph shows three different projections of human population growth. 16,000
14,000
UN High
12,000
10,000
Millions of people
А
UN
Medium
B
с
U. N. LOW
= 8,000
6,000
Actual
4,000
D
2,000 Estimated
0
1800
1840
1880
1920
Which two colored lines on the graph show the human population reaching
carrying capacity?
A. Line A and line C
B. Line A and line B