Answer:
BA
CB
CA
Explanation:
this simply means that such a letter combination stands for a line that goes through the points with these letters.
and a "ray" means a straight line (not one that goes around a corner). "from this figure" means lines (or connections between points) that are drawn in this graphic.
BA yes
B is just a point, no line. therefore, no.
DBA guys around a corner (from D to B, and then from there to A). therefore, no.
AD would be a straight line, but it is not drawn in the graphic. therefore, no.
ADB is partly not drawn, and it goes around a corner. therefore, no.
CB, CA are both straight lines in the graphic. yes.