Planning (a):

Organic acids are usually weak acids, due to the fact that the H+ ion associated in organic acids are only partially dissociated. Also, a solution with ions dissolved in it allows it to conduct electricity. Therefore different dissociations will affect its ability to conduct.

Different organic acids have different levels of dissociations. E.g. for methanoic acid the dynamic equilibrium of dissicoation is:

Since H+ is one of the ions that can carry a charge, the more ions there are in the solution, in theory its electroconductivity should increase as well. Electroconductivity, in its simplest explanation, is how conductive a substance is, in other words its resistance. The higher its conductivity is, more electricity can pass through without much loss and thus lower resistance. Electroconductivity can be measured and compared with the use of a conductivity meter...