a)
1) Since in this Dilation, the point of dilation is not on the line, then we have two options: it is dilated about the origin (0,0) or dilated about any other point.
2) If it's dilated about any other point then we have a translation. But in all cases, a K factor smaller than 1 indicates the image of that line is half of the original line.
3) Examining the options then we can state that the true statement is a for there is not enough information about the location of that point of dilation.