D the 13 amp fuse, so that the cable won't be over it's current limit.. and the heater will have lots of current.. to keep you toasty :P if you pick any fuse smaller then the 13 the heater will "blow" those fuses :/
<span>Suppose that an electric charge is produced on one part of a body. If the charge spreads through the entire body, the body is most likely made of metal. </span>