It would be more appropriate to use the word boundary than its synonym edge when describing a.) an edge on a map b.) an edge of a ruler. c.) an edge of a scarf. d.) an edge on a street sign

A.) an edge on a map.

Explanation:

This is the most appropriate case in which to use the word "boundary." A line that sets a limit on a map (for example, to limit the extent of a country) is called "boundary." It can also be called "border" or "frontier." Although the word "edge" is often a synonym, it cannot be used in the same way in this particular case.

she was killed in her home during hurricane katrina. b.she was relocated to another town after hurricane katrina. c.she died trying to get victims of the hurricane to safety. d.she is still missing — police do not know where she is.

the red coloration of the lungs looks alarming and adds to the overall message that the flu is threatening apex