Got an email asking for a midterm progress report in math! URGENT. I have three days to respod!!!!!!

How do you respond to this? Will typing out "I have a B" suffice? Do you need to post proof? Has anyone ever had to submit proof after answering this question? Dear David, We have received your University of California Undergraduate Application for Admission and Scholarships. Thank you for your interest in our campus. We are in the process of reviewing your application. Before we can complete our review and reach an admission decision, we need the following information from you: Please email me a midterm grade for Math 47: Mathematics for Liberal Arts. Thank you. We must receive this information within five days of this message date, or processing of your application may be delayed or canceled.