A scientist measures the growth of a bamboo plant over time. The table
below shows the results.
Time (hours) Height (cm)

10
1.2
20
1.5
30
1.8
40
2.1
50
2.4
60
2.8

How tall was the bamboo plant after 30 hours?

OA. 2.1 cm
OB. 1.8 cm
OC. 1.5 cm
OD. 2.4 cm