Set up the bulletin board as a graph where your kids can take this survey. Here is an example graph
you may wish to replicate. You can use tape to form the columns for the chart. Your students can either simply make X's in the appropriate column, or they can write their names. Or you may like to use photographs if you have them. After all the results are in, your students can refer to the bulletin board to answer all kinds of questions about the class' choices.