Test 3 Section 2 - #18 (page 518)

We're just going to want to draw this one.  Start by drawing 6 points, no 3 of which lie on the same line (a good idea is to put them roughly in circular shape):

Now just start connecting them with lines (counting as you go, making sure not to miss any).  Start by going around the outside:
That's 6 lines.  Now connect everything else through the middle (remember to COUNT AS YOU GO):

It's confusing to count them all up afterwards, which is why you need to count as you go.  If you were careful, you counted 9 more.

That's a total of 6 + 9 = 15.  (A) is our answer.