Answer: Wheel and axle
Explanation:
Wheel and axle is the best answer. Technically that's not the primary part that steers a vehicle though. A pulley is in the engine and I've never heard of wedge and first class lever. The question isn't too clear, but yea, I would pick ii if I was in your spot.
2.
The reason why is because there are 2 available electron spots on the orbital for the oxygen atom. Hydrogen atoms have one proton and one electron, thus, in order to fill the oxygen atom orbital to a full outer shell, a maximum of 2 atoms could bond with the oxygen atoms.
6 electrons (oxygen)+ 1 electron (hydrogen)+ 1 electron (hydrogen)= 8