Final answer:
The answer to the student's question is 'clip mart.' 'Clip mart' is likely a typo, and 'clip art' can be inserted into Excel, along with pictures from file, online pictures, and shapes.
Step-by-step explanation:
The correct answer to the student's question, "Which of the following is not an example of an illustration that can be inserted in an Excel worksheet?" is clip mart. The term 'clip mart' appears to be a typo or misunderstanding, as the correct term is clip art, which is indeed an illustration that can be inserted in an Excel worksheet.
In Microsoft Excel, users can insert various types of illustrations into their worksheets. Options include pictures from files that are stored on the user's computer, online pictures that can be sourced directly from the internet through Excel's integrated search feature, and shapes that Excel provides as part of its built-in drawing tools.