Find the slope of the line. \( y=0.4 x-3.2 \) Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. The slope is \( \square \) (Simplify your answer.) B. The slope is undefined.

1. The slope-intercept form of a line is given by \[ y = mx + b, \] where \( m \) is the slope and \( b \) is the y-intercept. 2. The given line is \[ y = 0.4x - 3.2. \] 3. By comparing the given equation with the slope-intercept form, we identify the slope as \[ m = 0.4. \] 4. Therefore, the correct choice is: A. The slope is \( 0.4 \).