Multi-choice problem: Choose from the options at the end, and answer how do you do this: How can ropes be used for climbing trees?

Choose your answer from: a). Ropes can be used to climb trees by attaching the ropes to the tree and then climbing the rope by looping a coil over your foot, holding it in place with your other foot, pulling yourself upwith your arms, readjusting your feet each time you move up. b). Ropes can be used to climb trees by attaching the ropes to the tree and then climbing the rope by looping a coil over your foot, holding it in place with your other foot, pulling yourself up with your feet, readjusting your arms each time you move up.
a).