RE: Dynamics 365 P1 Trial for Information Workers
                     
                    
                      
                        Hi Jack,
when you access trials.dynamics.com you need to choose 1 app (sales, customer service,  in order to proceed with the trial instance configuration, however you can add the other solutions after the initial configuration,
when you already have a trial configured under the tenant you will prompt to the second image where you can select all the apps to be installed on your trial environment for example


I hope its answers your question.
thank you:)
Teresa