A number line from 0 to 2.0. Point A is at 0.4. Point B is between 0.4 and 0.6. Point C is at 1.2. Point D is between 1.8 and 2.0.
Round each decimal to the nearest whole number.

A. 0.4

B. 0.5

C. 1.2

D. 1.9