How to Analyze the Trend of Data In Google Spreadsheet and Excel

Question

I am using google spreadsheet to gather survey data: The spreadsheet looks like this

Timestamp            Choice    Comment
1/15/2013 4:24:29    A         Comment goes here
1/15/2013 4:24:32    B    
1/15/2013 4:24:37    A    
1/15/2013 4:24:40    B    
1/15/2013 4:24:44    A    
1/15/2013 4:24:48    A    
1/15/2013 4:24:53    A

Is there any way to compile the information and create a line graph to display the trend of A and B over time?