Are there any trends for electrical conductivity? Which element has the greatest electrical conductivity?
  (A) $\ce{As}$
  (B) $\ce{Ge}$ 
  (C) $\ce{P}$ 
  (D) $\ce{Sn}$ 


I am unsure of how to approach this problem. Is there some sort of trend for electrical conductivity or some other method to determine which of these answers the question? 

I am pretty sure it is not $\ce{Ge}$ as that is used for semi-conductors, and am pretty sure it is not $\ce{P}$ because that is a non-metal but I don't know how to narrow down between the others.
I am unsure of how to approach this problem.


No, you are not! You have already reduced the number of candidates by good reasoning!

At this point, one 


could have a look at conductivity tables or remember in which period the metal blocks start for every main group or
remember typical electricity-related uses of $\ce{As}$ and $\ce{Sn}$


Did you ever form a conducting connection between electronic components (or just some wires) by soldering? $\Leftarrow$

(Do you recall that $\ce{GaAs}$ is used as a semiconductor material in thin film solar cells?)