Aromaticity by the Hückel Rule

Of the following compounds (A through J), which would be considered aromatic by application of the Hückel Rule?
Be sure to enter the appropriate letters in the answer box, up to seven selections may be entered.
Do not enter superfluous characters, since they will be counted as incorrect answers.

Enter your selections here:  

 

This script written by William Reusch, Dept. of Chemistry, Michigan State University. Please send comments and corrections to whreusch@pilot.msu.edu.