If you are just starting go on khan academy and go to the computing section and they will start you out on the basics on code devoloping.
Two types of physical connection are:
A wired connection using a cable
A wireless connection using radio waves
It would be A because B could be answered best with a poll graph, C with a pie graph, and D with a bar graph. Line graphs typically show speed and rate so A makes the most sense, but you are still able to do the other questions on a line graph.
