To determine which point does not lie on the line given by the equation \(2y + 5x - 4 = 0\), we will substitute the coordinates of each point into the equation.

Step-by-Step Verification:

1. For Point A (0.8, 0):
- Substitute \(x = 0.8\) and \(y = 0\) into the equation:
\[
2(0) + 5(0.8) - 4 = 0 + 4 - 4 = 0
\]
- Since the left side equals the right side (0), point A lies on the line.

2. For Point B (1, -0.5):
- Substitute \(x = 1\) and \(y = -0.5\) into the equation:
\[
2(-0.5) + 5(1) - 4 = -1 + 5 - 4 = 0
\]
- Since the left side equals the right side (0), point B lies on the line.

3. For Point C (0, 2):
- Substitute \(x = 0\) and \(y = 2\) into the equation:
\[
2(2) + 5(0) - 4 = 4 + 0 - 4 = 0
\]
- Since the left side equals the right side (0), point C lies on the line.

4. For Point D (2, 3):
- Substitute \(x = 2\) and \(y = 3\) into the equation:
\[
2(3) + 5(2) - 4 = 6 + 10 - 4 = 12
\]
- Since the left side (12) does not equal the right side (0), point D does not lie on the line.

The correct answer is D. (2, 3).