I have received an exciting research internship offer from a professor but have simultaneously applied for certain funded research internship programs as well whose results I am awaiting. I want to let the professor know that in spite of my interest in working with them, I first want to weigh all my options and choose the best from them in terms of opportunity, experience, and funding. I want to convey to the professor that although I am thankful for the opportunity I can let them know my confirmation to the internship only at a later date. Can someone suggest to me a polite way to do this?
The internship is from May and I can confirm only by March 2021.