Hi lindaKer,
I would suggest adding calculated value control from the Control Pane, click the fx button to insert a formula, and use this formula below:
concat("You have selected ", Dropdown, ". Please ensure you are happy with your selection before moving to the next step")
Highlight Dropdown, click the button Insert a Field or Group, then select the drop down list intended. The Dropdown field will contain the value selected, therefore it would change everytime you select a different item. To hide this box if there's nothing selected, click the Manage Rules from the ribbon, select the Calculated Value control, and add a new Formatting rule. Set the condition to Dropdown is blank. Then check the box that says Hide this control.
I'm attaching a sample for your reference. Hope this helps.