Multi-select problem: How does the next paragraph end?

How to make a crossbow, bullseye, and bullets for backyard target shooting
Gather your materials.
You will need : 4 un-sharpened pencils , 1 old and crummy pen, one rubber band, a lot of masking tape, and some creativity.
Divide the 4 pencils into two groups of two and tape each group of two pencils together.

Available choices:
a). If you want an ordinary crossbow cut the string to 30 " lengths. This will allow you to sharpen it, but generally you can get around 18 "..
b). Tape one group of pencils on the other group of pencils to form a " t " shape. Take apart the pen and save all the parts..
c). Take a piece of masking tape and cover this front and back of the pencils. Cut a sheet with the tape on it as you go so when you release the paper it will stay in place..
d). Give one group a line with tape, cut just 3 inches, that will go across the edge of the pencils. Pinch the tape against the line to make it into a " c "..
b).