To answer the question, you do not need to move the puzzle piece into the square with the question mark. The puzzle questions are not drag-and-drop. Simply click/tap on a puzzle piece to select it. You will then be able to select Next and go on to the next question.
Also, please ensure that you are not on the Section 2: Problem Solving Instructions page. If you are unable to select a puzzle piece, you may be trying to complete the example question (shown below), for which you do not need to pick an answer. The sample page video shows you how you should be answering the questions. Simply click Next.
We recommend using a computer or tablet with the latest version of Google Chrome as your browser. Alternatively, we suggest you try a different internet browser (Safari, Edge, or Firefox) and/or device to see if the issue continues. For more troubleshooting tips, read our following article: I am having technical issues with Plum.