A scientist created a scatter plot to represent the heights of four plants over time. Then, she found a line of best-fit to model the height in centimeters of each plant after x days. The equations of each trend line are given in the table.

Trend Line Equations
Plant
Equation of trend line
1.
y = three-halves x + three-halves
2.
y = 2 x + 1
3.
y = one-half x + 3
4.
y = three-halves x + 1

According to the trend line equations, which plants are growing at the same
rate per day?

A. 1 and 2
B. 1 and 4
C. 2 and 3
D. 2 and 4